65A cardback question

[peekaygee73]

I've a 65A Weequay MOC which has a noticeably lighter black background on the front of the card (you can see the black around the ROTJ logo is a darker black). The litho isn't as shiny as other MOCs too. I'm sure I've read about this before but having had a quick look around can't find anything. Is this common to all Kenner 65As? Or just some?