If you have different but identically named stats the new stats shouldn't overwrite the stats already in the database.
Are there any stats in particular that you're worried I'd be duplicating?
Oh and because I can do this to make you guys drool, here's what the by M popup looks like:
- byMpopup.png (6.22 KiB) Viewed 894 times
(I'm writing up the post and exporting the layout as soon as I finish this post and the actual layout should be available very shortly