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The command 'opatch lsinventory -details' will provide a list of components installed within a specific ORACLE_HOME. You could also consider to run the RDA tool on all environments, that will get you a wealth of info.
Looking at the versions it seems that server1 has a AS 10g enterprise edition installed with an older 9iAS install (most likely to run Java servlets as 9.0.3 did not include other components such as Portal, Forms etc.)
The same thing is true for server2, the 10g R3 release was a Java only edition, no Forms/Reports/Disco/Portal.
You are right, it seems like there is no way of actually getting a banner telling the exact edition, but as you say, one must deduct it from the products and options installed.