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So, if Tzeentch is the god of ALL magic, can he and his servants use the magic of other chaos gods? This is a question about fluff, not about the game.
For example, can the Lord of Changes in fluff use the magic of Slaanesh or Nurgle?

There's a number of ways for Tzeentch daemons to learn/steal spells from enemies in-game so there's always that. Fluff wise though, they wouldn't because their own magic suits them better. It is simply in their nature to use Tzeentchian magic because they are Tzeentchian magic.

I believe that Tzeentch is the god of magic *itself*, not of particular spells, but the arcane energy of magical weaves.

I'm not sure if this is still canon, but I recall reading a story that at one stage Tzeentch knew every spell that had existed, that currently existed, and that would exist in the future. The other three gods fought against Tzeentch because of this terrible power and threatened his survival. Tzeentch bargained a ceasefire after he willingly choose to forget most of these spells. That is why he has secretly commissioned the Blue Scribes to record every spell throughout the realms - so that he can once again rediscover every spell.

 NinthMusketeer wrote:
There's a number of ways for Tzeentch daemons to learn/steal spells from enemies in-game so there's always that. Fluff wise though, they wouldn't because their own magic suits them better. It is simply in their nature to use Tzeentchian magic because they are Tzeentchian magic.

Tzeentch casters can steal spells "that is possible for the model to cast"; doesn't that mean they can only steal realm spells/other tzeentch/chaos mortal spells? It's pretty limited what they can get. No faction spells, no endless spells. Or am I reading/interpreting that incorrectly?

That is a newer rule, I'm not sure if it has any use in matched play (faction spells require allegiance to learn but not to cast, so if a Tzeentch model steals it they can still cast it) but in narrative play it prevents a theoretical loophole involving the endless spells of other factions. It is also just a good catch-all to have around and nip exploits in the bud IMO. In game Tzeentch also often hits the same thing as in the fluff; enemy spells aren't as useful to Tzeentch wizards as the ones they already know.