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Actually, Kauyon don't really contain much for the new player in terms of rules.
Kayoun+6th edition tau codex=7th edition tau codex. AFAIK there is nothing in kauyon that the 7th edition codex does not contain (and I own kauyon) unless I forgot something, everything in kayoun rulewise is also in the codex.
That is, assuming you got the 7th edition codex, and not the 6th. if you got the 6th, kayoun is wonderful, because as said the kayoun has all the updates from 6th to 7th listed out, between new units, unit updates, new formations, etc.
Fluff-wise, it has quite a lot. an entire war is detailed there with several big events (at least big as compared to how much the tau empire is big compared to the 40kverse)
Mont'ka is slightly different. it has multiple new formations, the Farsight Enclaves sub-faction rules (with their own signture systems, rules, etc.)
Between the different formations they got (including a FSE-only "multi-formation detachment") they make a rather different army, focused far more on mobile warfare, rather
than the gunlines that the classical tau empire encourages.
As for fluff, it continues the story from kauyon, and some more major things happen (won't give any spoilers.)
Now, if you have the FSE supplement already, you have the FSE fluff, but the mont'ka rules practically override the FSE rules a bit, and provide much that wasn't there before. if you don't have the FSE supplement, getting it if you have mont'ka is for fluff only.
And while we are at it, there is also forgeworld's taros campaigen book, that has the fluff of a whole other war-and a slew of more unit rules, but no formations, or any integration of taros units into kayoun/montka formations, so they fit into CADs only unfortunately. (until FW makes formations at least)
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