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I've been practicing my sculpting skills, and i'm wondering how similar are they in consistency?
I often find that the blu tac is a bit too elastic for my liking.

They aren't.

Greenstuff is a two-part resin that hardens into a solid within a few hours. While you're working with it, you need to keep tools wet unless you're working with silicon "color shapers".

Blu-tac is a soft putty made from rubber that stays soft and really isn't meant to be sculpted.

Not very...

Edit:
Ninjaed

...is this an attempt to troll? Like... for real?

They aren't even remotely close to being in the same category of product. GS is sculpting material, blu-tac is an adhesive material.

i was being serious, and I know that GS hardens and is a 2 part putty, but how similar physically are they?

Not that similar - GS tends to be stiffer (unless the blu-tak is cold).
Note that I have used blu-tak on a model before - once I had the shape wanted I coated it in super glue & it set hard.
This was back in the 90's & the model is still in good shape (although he has been stiting on a shelf rather than being gamed with).

I haven't used it on any models, just as practice for GS

Well if you want to train your sculpting blue tac isn't the way to go. Both are fairly different. Blue tac isn't as smooth.
And to be fair if you want to sculpt with GS then the best is to also train with it. Because as GS cures overtime you have to get e feeling for exaclty this behavior during sculpting and how it affects the putty consistency.
And GS isn't that expensive that you need to make dry testing.
If you are that limited on money maybe look at milliput or other cheaper GS alternatives. Or get some oven baking polymer clay if you want something reuseable that is actually ment for sculpting with it.

What do you want to archive with it?

Just general conversions, and maybe (if I get good enough) some body parts (?).

Buy some & try it.
Keep it in the freezer to keep it fresh.

As to Practice Material Super Scuplty acts very similar to GS ..
Use it as it wont completey harden on you till its baked in the oven ..(it will lose elacticity and start to dry out over the course of an hour of working with it if you do not rewett it ..)

Get your green stuff (Kneadalitte Blue/Yellow .) in tubes..not in ribbon form ..(tubes cost much less ounce per ounce and much less wastage as the two parts do not come in contact till you mix them) and it is often carried at plumbing supply stores as well for far less than modelling stores (ounce per ounce)


Automatically Appended Next Post:
Now if you are going to do body parts ..Use some paperclips (as armatures) and super scuplty ..then bake them and glue them on the model ..For Seperate bits I find Super sculpty to be excellent ..
Warning do not bake the model ...just the part you made with the baking polymer..

Poster tack is generally much softer and more elastic than even freshly mixed, yellow-heavy GS. I've used it, on occasion, as a temporary stand-in for epoxy putty when doing a "dry run" of planned sculpting work, just to check general feel and proportions. It can be worked into rough shapes and will take to crude texturing, but that's about it. As a practice tool, it won't do you much good - personally, I'd say that you'd be better off with modeling clay, which behaves quite differently (lacks the elastic "spring back"), but gives final results more indicative of what you would achieve with GS.

Really, though, there's no substitute for the real deal - if you buy the larger tube (separate plugs of blue and yellow - joined strips lead to waste and generally cost more, ounce for ounce) of Kneadatite, sacrificing a bit for the sake of experimentation really isn't all that costly. At ~$12 (USD) for the tube, a full 28mm troop model's worth of putty amounts to a buck or so. If you're just doing detailing and minor gap-filling for conversions, each attempt, final or practice, literally costs you pennies.

If you've already been practicing and are wondering how directly your experience will transfer, I'd say "not much, but it wasn't a total waste." Poster tack is a to try and sculpt. So is GS, until you get used to it - I absolutely despised the material, starting out (we've come to terms, even if we're still not bosom friends). Sculpting with a material you have to fight, due to its elasticity, will prepare you for the worst of GS (one aspect of it, at least - I found the stickiness more problematic, until I moved to silicone-tipped sculpting tools). Once you get into it, though, things only get easier.

Get the greenstuff from somewhere other than GW. Its quite affordable this way.

Galfeforce 9 100g tubes. £9
http://www.thetrolltrader.com/catalog/gale_force_nine-gf9_scenics/green_stuff_basic_epoxy/5627

Troll Trader 72 inches of ribbon. £10.99
http://www.thetrolltrader.com/catalog/green_stuff/72_inch_kneadatite_green_stuff/5647

Games Workshop 20g of ribbon - £6.15
http://www.games-workshop.com/gws/catalog/productDetail.jsp?catId=cat470007a&prodId=prod1380024a

I dont know how long the 20g of ribbon from GW is or what the 72inch from troll trader weighs, but its not anywhere close to 72 inches. And if the center of the ribbon possibly being set slightly is a bother to you, GF9 do the separate tubes.

Blu-tack is not even close tot he same thing, the question is riddiculous does indeed seem like trolling. Don't you have eyes/ fingers? You really had to ask how similar they are?