This is only really an issue if you're trying to pass your rep off as gen.
Not really...it's the same reason why so many sub fans obsess over the SELs or case shape. Same reason why Daytona fans obsess over caseback thickness. Same reason why the Panerai fanatics obsess over the CG shape and CP size...or the placement of the engravings on the movement.
I own the BB red and its a fantastic rep, not quite super-rep, but getting there. I love the green bezel of the Harrods edition, but I think I'll wait a little bit to see if the caseback can be repped as well.