I just went and had a look at the old spring from the Luger. No discernible difference in coil density from end to end - and I don't recall a difference on the new spring either.
ETA: Take a look at Thor's article on Luger mainspring replacement. My spring looks just like the one pictured there - no difference. Nor does he mention one. I think we're getting our legs pulled...
I also looked at the old Nambu springs - and can say the exact same thing about the springs. Perhaps not all makers make them like your picture? I'll pull the Nambu back apart when I'm cleaning guns anyway, and have a look, but I'm pretty sure there's no difference there either...
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