It will indeed need fairly radical rebalancing, which will prob involve adding weight - not the easiest of tasks compared to removing.
If they are dimensionally the same is something left to the wizard experts on this site, because googling the part number returns zero results. That is very rare. I suspect the very early A7 cranks may have differed but IMU (understanding) the "small journal" size was common to A7 and A10 right through the 1950's.