Is a 2TK clutch basket the same a 3TJ one?

I don't think so.
The 2TK is the 1WG SP but it's before the 3en1 and 2. Yamaha updated most of the bike when it went to 3TJ .... you'd be better off looking at a 4JH engine from the ThunderCat or Foxeye 600.

The 2TK clutch is the same as the 3TJ SP, they also share the same gearbox (close ratio)