Is there a difference between Linn LP12 lingo 1 vs lingo 2 other than the case?

Earliest versions of the Lingo 2 were identical to the Lingo 1 ( known as the shoe box) except for the case. Later versions were slightly modded as to how the board was connected and mounted and a few other minor aspects...leading to a difference in SQ.

@robob  Lingo 4 is contained in a much thinner box (slimline) than any of the other Lingo's.