With a Content Porter export from 2011 SP1 HR1 I see the following error when trying to import into 2011 SP1:
Index file has incorrect content.
I guess it's not possible to port in to a "lower" Tridion even if it differs only by a HR?
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I am assuming you don't want all of the content in the 2011 SP1 instance, or you want to merge it with content already in the 2011 SP1 HR1 instance.
Perhaps DEV is 2011 SP1 HR1 and PROD is 2011 SP1.
If possible, depending on environments, you could backup the 2011 SP1 database and upgrade it to 2011 SP1 HR1. Then the import should be no problem.