The board with the display is the same. I'm sure you figured out the front face is different. Here is a link that is very informative: http://forum.casperselectronics.com/forum/index.php?act=ST&f=5&t=82
The climate controls are the same for all 82-86 Regal. The units in the Park Ave and Riviera may look the same but there is a difference in the electronics.