That is a good question as the CBN wheel cannot be altered to fit the bar. I went through something similar with a 8" bench grinder and the Tormek tool rest, but that could be adjusted to be parallel. All I can think of is that the tool rest would need to be shimmed square if there is a discrepancy. Fortunately, you can leave the tool rest in a fixed position and adjust the blade for projection if this is needed - all Tormek owners I know of have not experienced any such discrepancy.
Regards from Perth
Derek