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Yes, 3dZeropad will work fine. I tend to use 3dresample because
it is much more general, and using -master allows one to be sure
the dimensions and grid will match in a single step.
Anyway, I just wanted to be sure that your voxels are in the same
place, and they are. So either method is fine.
I would have been more worried if your second dataset showed
an R-L extent of -90.5 to 90.5, for example.