Yep.
You want your step/dir signals wired differential.
Using the open collector way like you would with steppers is no use.
I was told OC is only good for 150khz reliably. So a breakout board that can wire differential is desirable to achieve the wanted 400khz such as the UB1.
There are converter boards to go between the bob and servo that can convert OC wiring to differential but I've never tried them.

Adjust the electronic gearing to suit whichever kHz setting is being worked with.