the only difference is the new modes selectable by the switches and the TRANSPOSE button having re-assigned functionality. The only function that is missing after installing Juno-66 is key transpose.
However, if you were originally using it to transpose chords, you can now do this in chord memory mode.
Key Transpose = OFF (not lit)
Arpeggio Mode = Up (all the way up)
Arpeggio Range = 1 (all the way up)
Yes that is correct.