You don’t mention what OS, hardware, or DAW that you are running,
but you should be aware that in a Toontrack default installation,
EZDrummer2 will install over top of EZDrummer1.
The two products cannot exist on the same PC or Mac…
Beyond that, AFAIK, MIDI created in & exported from EZDrummer2 should import flawlessly
into EZDrummer1 (using the same EZX expansion & mapping).

PS. updates to your older EZX’s are FREE!!! in order for them to run under EZDrummer2,
available in your Toontrack online account.