Hi mate. Yes the set is matched and have no issues.
I have a similar kit on my X2.
The 36v is to power the drivers.
The drivers then basically send whatever the motors ask for to them.
As long as you stay within the driver specs it's fine, I've seen many that have upgraded to a 48v supply.
One thing I did notice is a difference in motor inductance compared to the ones I have.
WT57STH115-4204B