Importing a character with a different sheet

I was wondering if it is possible to import a character that has a different sheet layout than what has been chosen for the game. I’m used to the standard roll20 5e sheet and the game has a different one as it’s default. Is this possible?

You can but you shouldn't. ;-) The problem is that each sheet has it's own attributes and calculations and while there may be some common attribute names between various sheets, the handling of those attributes on a given sheet could be entirely different than another.  Changing sheets with the same character attributes can cause some strange behavior and miscalculations.