I just stumbled upon this info last night while looking at Jetsgo's fleet. Their MD-80 are a mix of 83's AND 82's
MD-83's are C-GKLK, C-GKLN, C-GKLQ they are equiped with JT8D-219 engine
MD-82's are C-GKLJ, C-FKLC, C-GKLR they are equiped with the JT8D-217C engine.
Does this affect the range of the aircraft and performance? I wonder what the 7th aircraft will be?
Information is from http://www.jetphotos.net there is a census at the bottom left corner.