Roland MT-32 and TR-626 were released at around the same time in 1987. The drum PCM samples may not be exactly the same, but have similar character that may be inherited from the older model, TR-707. To me, they have good enough attack and bass.
One good thing about MT-32's rhythm section is that it can use any synthesized tone. You can create new percussions in the normal patch mode, using 4 oscillators with ring modulator structures, and then map them on the keyboard. Roland D-10 Series share this feature as well. It's the most advanced drum kit feature still today.
I think GM Standard interfered this line of drum kit evolution. As GM strictly defines what drum sounds should be assigned to which keys, there's little room for user's editing. In GM, a snare key always use snare sample, while we can always make interesting snares using any sample, noise, hi-hats, etc. As most synth went GM compliant, synthetic drum kit has gone into oblivion.

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