These two pairs have the same two plate varieties side by side, but the overprints are not identical. These plate varieties remind me of the alternating row pair of plate varieties in the type I 10c red plate. It is interesting to note that both pairs were postmarked on the same town and on the same day. They were likely from the same block.
The first pair:
The second pair:
Maybe someone has a large block of this stamp showing these repeating plate varieties?