Is it possible to create two distinct URLs to access the same portal. One will be internal and limited to administrators and API Owners accounts, the other (public) to developers?

Release:
Component: APIPRD

If this is the same portal tenant (i.e. managing the same API's/Applications) then currently there is not a way to separate the interface but you can have two authentication schemes on the same page which can restrict roles allowed based on approvals and the role mapping configured for users.