You really need to get things hooked up to the new controller before you can tell. It is very likely that the Bandit is screwed and thus your amps are reacting to signals from it.
Sad thing is you have resolvers on the motors so you will first have to replace them with encoders as although the Kanalog can take resolver signals the reply from Dynomotion on the effectiveness of resolvers didnt sound too promising.
The contraves amps are decent amps, I had the NC700's on the Beaver mill when I got it and the reason I went with different motors/drives was mainly because at that time (23 or 4 yrs back) there were not the options for devices that could control analogue amps and work with Mach. Things have changed and there are at least 4 options now, you have one of them so you should be fine. The only other thing that I disliked about the Contraves amps was they whistled loudly, it seems to be at a frequency that either you get driven daft by or you hardly hear it, I was the former.
You could hook up a battery box to the amps to test them out, what that entails is disconnecting the signal wires from the amps then hooking up a 9v battery that goes through a pot, you can then make sure the amp is enabled and then increase or decrease the battery voltage via the pot and the motor connected to that signal should react according to the voltage.
Hood