Jboss java-ee implementation classes in another vendor's AS

In my opinion an application server does not only comprises of bunch of .class files implementanting java-ee specification,
But it is the combination of those files plus the server itself
because for example the behaviour of EJB or servlets or whatever objects cannot be hardwired in in a .class, I mean the server has to manage those classes in a way that is adherent to the specification.

Am I right ?

From this consideration arieses my question: is it possible to use Jboss implementation of java-ee api in a AS by another vendor, say Weblogic for instance ?