Some changes I noticed from original/MTL release to Official release:
-Number of save slots: MTL has 300 slots, Official has 100 slots.
-EXP required to level up: Girls level up faster in Official as they now need less EXP compared to MTL.
-Each girl now has different [EXP next] despite in the same level. Double checked my MTL save they all had same [EXP next].
I noticed it when comparing my current play with Official version to my past play with MTL version.
First screenshot for MTL version
Second screenshot for Official version
I remember in MTL version my girls were at level 4 by the time they finished exterminating monsters quest in farm, however this time in Official version they were already at level 5 even though I didn't powerlevel at all.
Pienetta as level 1 needs 50 EXP in MTL to level up however in Official she needs only 12 EXP to level up.
The Official version is really a blessing. Like it fixed some issues in original version, maybe to make it less frustrating.
I think I also understand why each girl now has different [EXP next] with Pienetta the most. To make sure other girls' level won't lag behind her, especially if you overlevel when playing as Pienetta alone and other girls are mostly not with you in early game. Now with each girl at equal level, Pienetta needs the most EXP to reach next level compared to other girls.