Yet another question for Completionist Guise

So I'm making my own deck that has a function similar to what Completionist Guise does (Swap out Character Cards) and the question arises; what happens to the HP of a character card swapped out if their current HP is higher than the new Variant's Max HP? Does it just automatically go down to the Max HP or do they stay above Max HP until brought down and simply cant' recover more than their current Max HP?

Anyone up for this?

It will go down to the current Character Card's maximum HP.

Health cannot be above maximum.

So if the new maximum is lower than current health, health would reset to the new maximum.

I use the unofficial term reset because you aren't losing health, your health is just changed.