When I ordered our Photopass pics online after our trip last year, I was able to have them printed in the various sizes. The standard digital "size" is 4 x 5.3" (or something close to that) vs the 4 x 6" from 35mm film.
When I ordered the 4 x 6 prints I was able to select them to not crop. The 4 x 6 prints had a small white border at the two short ends. I just cropped them off before using them in my scrapbook album, putting them in frames & handing them out to the family.
A friend of mine ordered her prints as 4 x 6 and some of the borders (parts) were cropped out of the prints.
Good luck!