Going by the key spec (current and inductance), they are pretty much identical motors.
However I'd say 70V is too high. The recommended max voltage is 32 * SQRT(L) (L is inductance), which puts the recommended max voltage around 57VDC when running with parallel/unipolar wiring.

A higher voltage won't have much effect at lower speeds, however if you're running at higher speeds, overheating is likely to become an issue if running at the rated current.