Trunk lid moldings 68 Cuda are both the same.

Here's how I tell the difference between top and bottom moldings......

The bottom molding has a black accent line where my pen is pointing and that particular area has a "channel" where the accent line is located.

The top molding has the accent line laying flat against the center portion of the molding and has no "channel".

Looking at the profiles from the end, you can see the difference in the shape where the bottom piece has the "channel" where the black accent line is.