The latch is different only in the shape of the release mechanism. On the 60-61 hood the release handle points down and is accessed in the gap between bottom of the hood and the grille support. The 62-66 hood release is in the rectangular opening on the hood itself. Here's a picture of each type:
The lower striker plate is the same, although the pin length is apparently different in some applications. I'm still running the original 1960 lower plate that came with my truck and don't remember adjusting the pin length at all. Doesn't mean I didn't, I just don't remember it needing adjustment.
The nice feature of many big truck hoods is that because they are so much farther from the pavement they are frequently undamaged and rust free, having avoided road salt. Not always, but enough to make it worth looking at them first if you find any candidates.