Hi,
Maybe these transitors are used at gate drivers for class AB Mosfet audio amplifiers...
If so, then neither hfe mismatch nor Vbe mismatch will cause audible distortion.
The very most of the error is canceled out by the feedbacked system (open loop gain).
This is different to the transistors at the difference amplifier stage. There V_be mismatch may cause (amplified) offset at the output.
Thus "matching" with transistors in this stage makes more sense.
But for sure you may sell matched pairs. I assume there are some audio enthusiasts that are happy to get pairs.
Hfe or Vbe: I tend to match hfe, because Vbe just causes inaudible "static" offset and additionally this is cancelled out by huge open loop gain.
Hfe mismatch may cause unsymmetric dV/dt at rising and falling edge, which is a "dynamic" error. The faster the signal the higher is the influence of the mismatch. Additionally at fast rising/falling signal the open loop gain is low and thus the error can't be compensated optimally.
Klaus