If found a very helpful, detailed summary of EZ Drummer mappings. Here it is:
As you can see, the EZ Drummer kits frequently use the full allocation of 128 midi instruments. Many of these are varying articulations of a given piece, i.e. differently struck hi-hats, rides, etc. If you save these as midi from EZ drummer, and then add them to a BB song, you are going to have quite a few unsupported notes. And, while you could add some additional instruments to a BB kit, you are going to run out of space given the BB’s 100mb limit. You surely will not have the range of velocity differences available in EZ drummer.
For those of you looking for the magic bullet that will get EZ Drummer files quickly into BB, you are probably either out of luck, or looking at doing a lot of additional work to massage the files. If you kept your EZ Drummer kit to a minimal configuration, you could probably bring the midis into BB, and then just move the unsupported articulations to supported ones.
Maybe you can record the EZ Drummer files as loops and use the new Aeros Looper, if that’s the route you want to go.