The difference to 1968 and 1969 is quite glaring once one studies the changes. I am very pleased with the new concept car and have come to the conclusion it is a blend of 1968 and 1969. In 1968 the fender wheel openings are round as compared to the 1969 as being somewhat long at the top and oval per sae. The front grille is some what wider and the door does not have the side riser on the bottom to acentuate the rocker panel. The tailight panel is very different with a long tailight for 1968 and then even longer but narrower tailight for 1969. The backup lights were incoperated into the 1969 lights but placed below for 1967. I dont recall 1968 location.
The rear quarters were narrow and not such a pronounced 'Coke' bottle design. Don't get me wrong, Chrysler came out with that moniker in 1971. Chevrolet perfected it. The gauge package in the console was the same for 1968 and 1969. The side windows were one piece with no vent glass. The name Astro Air was embossed on the glass of 1968 where it was incorperated on the vent channel itself in 1969. There was little in sharable outside sheet metal between the years with 1969 as a stand alone.
Gald you seek the difference as there are many, including options avaiable. One thing that always peaved me and for no given reason was for the the lack of a real 'flush mount' rear spoiler. It looked unfinished and stood proud for at least 1/4 of and inch. It looked like an inferior design or lack of a moulding.
Hope this helps. D1