@TariqSoftDev Are you sure that that someone didn't damage any cables or something like that during the procedure? I even contacted one of the vendors of MB on eBay regarding the question. He again supposedly contacted his supplier who said they where interchangeable.
I also see a few japanese "SuperFamicom N3DS XL" editions being made into PAL/US versions. I'm sure they could all just have been lucky, but I find it more likely that the one person who didn't manage it screwed up somewhere.
I'm not trying to be harsh. I'm just trying to understand how it would even remotely make sense to have such an advanced production line.