if you have both EZkeys 2 and EZbass windows open at the same time and they are slightly overlapping, you can drag MID from the EZkeys 2 Song Track to both the EZbass Song Track (which will then ask you if you wish to Import Tempo and Time Signature) and the ‘Drums & Keys’ page.
You can also drag from EZkeys 2 or EZbass to EZdrummer 3 in the same manner. All of them can Import Tempo from MIDI files and EZbass can also read Chords from an EZkeys 2 Project.