Dana67Dart said

Go online and download the 68 Chrysler parts book. Then locate the window regulator section and start comparing part numbers.

1. Left to right would be different number
2. Front to back would be different
3. 2 door vs 4 door, don't know, but I suspect they would be different as well. (Longer glass)
4. They may share parts of the assy with each other

Good luck

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