X is the more emotionally engaging microphone for me, just from the first impression, not analyzing the sound. I prefer it on that voice (and probably on other sources ,too).
After listening closer, it is a little more sibilant, it is a little harder in the high mids and has more pops (could be placement) than y, but sounds truer to the voice, to my ears. Y sounds kind of phasey in the highs and has an extended bass compared to x, it sounds a bit cleaner but more processed overall.
Where the difference comes from is hard to guess...
The pops might indicate something else, but I would guess, it is the same capsule on different electronics, but that is really just a guess.
Thanks for the test, both mics sound great and I really would be happy using both.
Tobias