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Well the title says nearly everything, but what's the difference?
There's such a big price difference

Wikipedia wrote:The hair is obtained from the tail of the kolinsky (Mustela sibirica), a species of weasel rather than an actual sable; The finest brushes are made from the male hair only, but most brushes have a mix of about 60/40 male-to-female hair. Kolinsky bristles tend to be pale red in colour with darker tips. The weasel is not an animal that is raised well in captivity, and is generally isolated to the geographical region of Siberia. Due to this difficulty in harvesting the hair, and the fact that other natural and artificial bristles are not comparable in quality, these bristles are extremely valuable and consequently expensive. Those who use the kolinsky sable brush claim it has superior strength, slenderness, and resilience when compared with other sable brushes.

In practical terms, Kolinsky is just a higher grade than red sable. Other aspects of the manufacture determine final quality, though, so it isn't entirely safe to assume that one brush will outperform another based purely on the hair used. I picked up a few Rosemary & Co. sable brushes and actually prefer the "pure" (red) sable S.99 to the Kolinsky S.33, based on subtle differences in the head shape. If I bought two more brushes of the same size, that might change. Personal preference and production quirks account for much, so YMMV. If you're simply looking to save a buck, red sable from a reputable manufacturer is a pretty safe bet. The best of the best, though, are likely to all be Kolinsky.

I've always stuck with the dearer pure kollinsky sables, untill just recently, I got a few of each kind from Rosemary and Co.

I've not actually had time to try them yet, but I have some of the Series 101 Pure red Sable
http://www.rosemaryandco.com/watercolour-brushes/pure-red-sable/series-101

and some of the series 401 Red Sable Blends
http://www.rosemaryandco.com/watercolour-brushes/red-sable-blend/pointed-sable-mixture

to try out, and comapre to my series 33 pure kollinsky sables
http://www.rosemaryandco.com/watercolour-brushes/pure-kolinsky-sable/pure-kolinsky-pointed

and my W&N Series 7's.
Already well happy with the series 33 compared to W&N s7's being 95% as good for far less the cost.
The 'red sable' and 'red sable blend' are cheaper still, the 101's have a nice looking chunky triangular handle which looks promising.

I actually didnt notice there was a 2nd page with the series 99... I'l try that too next time I need some brushes. Rosemary & Co are fast becoming my favourites.

edit; AFAIK it being termed 'Kollinsky' means that its made from Kollinsky hair;

'The Kolinsky (Mustela Siberica) is a species of the Mink family, a member of the Weasel clan and a native of Siberia and northeast China.'

While being termed 'Sable' doesnt necessarily mean it had to come from that specific species of weasel.

' In my trade we refer to it as ‘weasel’ hair, this being a small member of the ‘Mustelidae’ family, native to Asia, North America and Europe. The Asian variety is the only one used in brush making and unique in length and fineness. The term ‘Sable’ is a misnomer, the hairs from the animal called a sable ‘Marteszibellina’ are not used to manufacture artists’ brushes! To produce a good quality brush I only use the best grade of tail hair skilfully selected and ‘dressed’ for me in Germany by a family who have kept their trade through several generations. Like most things the better the ingredients and raw materials the finer the end result. Beware of the less expensive so called ‘Sable Brushes’. Many contain little or no genuine Sable at all, regardless of what it says on the handle. Others may contain Sable hair which hasn’t been ‘dressed’ properly or indeed sorted by length.'

(Both quotes from Rosemary & Co website)

If they do infact come from the same weasel, then I expect that the 'Kollinsky' tagged ones are just the pick of the crop of hairs so to speak.
I can say for certain that Rosemary and Co 'Pure Red Sable' hair is a different colour than their 'pure kollinsky' hair. leading me to think its a different animal, or atleast a different part of the animal. Incase its not obvious; the 'red' ones are more red