< Once you have disabled it and edited a curve without history updating on, that will then break the history chain and you won't be able to get it back with those particular curves.

< But you could delete one curve and remake the other one by doing a new Mirror operation to get it set back up again if that's what you wanted.

Not exactly this : I had wished recuparated the "symmetry" between A & B but with their new size A big, B small! Because curves were integrated inside the Lofted surface.
A sort of differential move inside the lofted surface A & B moving & growing in the same with the Edit Frame
So Seems impossible

OK It's that i wanted to know! : Thanks !