I don't think one or the other is "fake", but I can see a slightly different width to the individual "knurls". The rectangles look a little wider on one than the other. Maybe that accounts for the weight difference?
I think the knurling on both of these is slightly different from mine. I could swear mine has a checkerboard look to it. Now you've got me wondering. Gonna have to check it out when I get home today.
I think the point was, that if the knurled sections were wider, they would have cut out less metal between the knurled sections making it lighter. That's how I read it anyway. In either case, I don't think what I described would have an appreciable affect on the weight.