FPM uibb having multiple enhancement

We have enhanced a standard FPM UIBB screen to add few fields.

Those changes have been moved to Production.

Now for new changes - we created a new enhancement.

Wanted some clarifications :-

Can multiple enhancements exist for same UIBB screen ?

Will all of them apply at same time and show the output ?

If only single enhancement is active at a time - do we need to delete other enhancements and just keep one ?