If I understand the question, no you cannot have two versions of the same map in the levels folder and switch between them. Fortunately, for those of us using DCF, there is a way around this.
For our server, -=AllianceServer.com=-, I have always wanted a helo Gazala and Gualalcanal. Well, now it is possible to have the regular version and a modded version. We run the regular DCF version and a modded version from DC .7.
This is a unique situation to this mod-of-a-mod type set up. For vanilla BF, or any other mod for that matter, it probably wouldn't work quite as seamlessly as the DCF/DC7 situation.
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Up The Irons!