Someone please help.

If I bought new drum sounds for my impc pro, what model mpc is that considered?

As far as I'm aware, the iMPC pro doesn't load MPC program files, so the MPC format isn't particularly relevant. Just make sure the samplepack has sounds in WAV format, as it is the sounds that you have to import into your iMPC and then build a program yourself.

All the packs on MPC-Samples.com contain WAV format files - if you have to select a format (on my site at least), either select 'WAV' or 'MPC Renaissance'