Rainbow Six have bought victories for the Xbox one and I would like to know if I have to buy this extra game for the PC, but if I can buy it extra with my previous account I can continue playing
Unfortunately I have to disappoint you: if you want to play Rainbow Six victories on the PC, you have to buy it A) again (via Uplay or Steam) and B) you can't take over your score (level, rank, disguises, etc.).
You have to start practically on PC again from scratch. At first sight, this seems rather bad, but at the same time it gives you the chance to build better statistics with more gaming experience (if that interests you).
I would recommend you to wait a bit, Rainbow Six often receives special discounts. Also, do not buy the Beginner Edition because you have virtually nothing, you can cost new operators a fortune, and you can't upgrade to a better edition of the game.
Unfortunately you can't do anything there. I know the problem, have up to about 12 exceptions, all camouflage and talismans on the Xbox and on PC much less
Is not it synonymous if I buy it through the Epic Games store, so must ihc sign me with an account of Ubisoft?
No, the ingame data can't be transferred in any way.