I wanna start trying to MB on my PC and I know this question have probably be asked before, but its late and I cant be bothered to search.

Basically if I want to MB with 3 or maybe 4 clients on one PC, does it matter if one client is WotLK enabled and the other 2/3 are just WoW classic and only really there to help me powerlevel a toon on my WotLK enabled client? (im not really bothered about not being able to use the other toons after 60, and plus if I can do it in less than 30 days I wont have to pay for the subs on the new accounts).

TIA