Sometimes the file names can be deciphered by looking at the sfz file created for the samples. Based on the SonicReality_JBSonrKit Floor Toms.sfz:
a. Yes
b. They relate to the velocities which triggers the sample.
JBSONR_F1_16.FLAC plays on MIDI note 41, velocity 0 through 16
JBSONR_F1_112.FLAC plays on MIDI note 41, velocity 98 through 127