I had an European Crazy Taxi and that had the same Sega mech too. But Crazy Taxi came out before Sega Europe started cost cutting and making (and I guess sourcing) parts locally.
Never owned a European Jambo or a High Roller of any region.
Ive seen some of those mechs on ebay, but the prices seem to be about twice what i paid for my whole cab
But the most probable thing is that someone just swapped the wheel on mine then.
Ill live with this for now and hope that a cheap mech turns up at some point!
Forgot to respond but thanks for asking your question @corpsicle and providing the images of your mech! That's what I have inside mine. Ping me if you want any other images to compare something.