secure GUI admin port

I have webmail running on the same Windows box as SM and I
have set the secure webmail port to the standard HTTPS 443.

Is there anyway to also have the secure admin GUI use 443?
My thinking is that the answer should be yes, because they
should have different URLs. But I am 6 time zones away from
the server and my brain is foggy.

The reason I want to do this is that local firewalls lock
down all ports except standard HTTP and HTTPS.

Neil