I don’t remember anyone else commenting on this (although I’ve been known to forget something now and then, so I could be wrong), so I thought I would.
If you order the passthrough sized plywood and cut it down to 20x12" sheets, the grain will run the opposite way from normal. For some designs, depending on how you like your grain to run, this can actually be a good thing; for others, not so much.
Also, one sheet will be an inch or so short on the 12" measurement.
Just thought I’d share my findings.