Paint code 65 Dart GT

Got a mate here that just bought a 65 Dart GT,not a bad looking unit either...
We have noticed a peculiarity though and thought I might ask here if anyone could shed some light on this...

The broadcast/build sheet that came with the car,states paint code as KK1 yet the tag on the fender says LL1 ???? Im pretty sure its the same colour but ones darker??

Any thoughts,gents?