I'd say they were pretty similar, just put your file in the modcp directory.
You can use the can_moderate() function to verify permissions I think. Then just use the construct_cp_nav() (I think), print_cp_header() and print_cp_footer() functions as usual. Most the print_* functions work the same in the AdminCP as they do in the ModCP
The best thing is to look at a few pages already in there and see what is common between them, that will give you a basic template for the page (which should be pretty similar to the AdminCP one.)
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