Crankshaft rear main oil seal

I am changing the rear main seal on the engine (L24 - 6 cylinder). The original seal body is thicker than the new seal body - meaning that if I put the new seal in, it will recess deeper in the main seal area. The actual sealing part of the seal fits properly on the crankshaft and the outer seal dimension fits properly in place too. I have searched for the dimension thickness of the seals that are available, and they seem to be all the same as the new seal I have.
My concern is - Is it ok for the new seal to be recessed in further (or to have a space behind the seal if it is installed flush with outer surface of the rear crankshaft) as opposed to the original seal? The original seal is.500" thick, and the new one is.375" thick.