Pair 325:
Noticed no differences on the Pokemon. Began wondering how loaded the other image was. Caught two on the first trip around. Found the tree berry(?) last. (Noticed them the first time. Looked closely at one, but not the others.)
Pair 326:
Put two overlapping boxes for the hands. Spotted it on the other hand too, presumably all as one difference. Caught it a little later, though. Overlapped the boxes instead of undoing the others and drawing one big box.
Saw five differences on the first look. Came back for the feet pattern for #9 overall. (Should have put overlapping boxes for that too. Just noticed while typing this out.)