Earlier on, I had a bit of trouble separating DuPont 5248/General Motors WE5919 and DuPont 60680/General Motors WE5915 but it does seem easier with scans instead of chip photos or actually comparing the samples in person. 60680 falls in between 5248 and 57401 on the fleet charts but as you guys can see, those three can be hard to tell apart at first glance.

I'm still looking for what color 3404 may be because apparently it's not 6808. LOL