You could attempt deleting it on the main account then uploading it under the same name on the second... but I'm guessing this would eliminate all the reviews/etc... If you decide to try it, please report back so others can know.
Otherwise your only option may be to just change the map name on the new account and upload it as a "new" map. Thus leaving the old version, and introducing a new version (old version could tell users about the new one in description and other places).
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I'm not sure if it's possible...
You could attempt deleting it on the main account then uploading it under the same name on the second... but I'm guessing this would eliminate all the reviews/etc... If you decide to try it, please report back so others can know.
Otherwise your only option may be to just change the map name on the new account and upload it as a "new" map. Thus leaving the old version, and introducing a new version (old version could tell users about the new one in description and other places).