他 全12曲収録予定
他 = other
全 = all (probably total in this case)
曲 = music,song
the rest pretty much means "recordings planned" or "scheduled"
So to me this would read like "Others(not common to both versions): a total of 12 tracks planned". I could easily be wrong.
Since one of them is first class and the other economy class, the higher end version will most likely include more of those extra 12 songs so it will probably be something like this:
Type A: 8 common + 8 exclusives
Type B: 8 common + 4 exclusives
or any other combination. That would be my interpretation. I guess we'll know when we see the track listing won't we? And this will probably be soon since the release is in a little over 2 months.
I'm just gonna add this. Passpo isn't the first group to do this (having multiple versions of a record, each with exclusive songs), but I don't really like it when the management of a group decides to do this. At least the first class version of Beef or Chicken got you
everything. Here, getting everything means buying both versions, and those things aren't cheap.