Remember you have to change the barrel bushing and the barrel.
Not always. Depends on what the barrel was made for. I got a TU-90 9mm barrel and I indeed had to get a different bushing, and the link and pin that came with it wouldn't work either. Had to use the link and pin from my 7.62 barrel. If the 9mm barrel was made for a TT-33 variant, I don't believe you need a different bushing.
Andy, I used the 9mm barrel for a while but I really prefer the original barrel. I got the conversion stuff back when it was available and cheap. Just sits in my safe now. I'll reload 7.62x25 if I ever run out of surplus ammo for my tok, but that will not happen soon.