Chevy Windshield trim 69-70 vs 71-72

[bvb69C10]

Can someone tell me the difference between the stainless 69-70 windshield trim compared to the 71-72 trim? The windshields are the same and the rubber is the same without the trim for 1967-72 model years. But when you look at the part numbers for trim and and rubber seals with trim the 69-70 and 71-72 differ. The reason I'm asking is I have a truck that's part 69 and part 72. Even though the plate on the cab matches the stamped number of the frame as being from a 69 I'm not convinced that the cab isn't a 72 with a transferd plate. That's why I'm trying to figure out the difference so I can purchase the correct seal to match my trim.