The pins look the same regardless of year. They will all be the same length, so that doesn't help. If the threaded section is a different thread size/pitch that will be almost impossible to tell in a picture.
You will need to measure the size/pitch of the threads for both the caliper brackets and the pins to figure out what's going on.
I mentioned this in your other thread, but I absolutely used 70-72 calipers with 73+ caliper brackets on my Challenger. At this point I don't recall if there was a model year associated with the pins I used, I don't believe I bought them new so they may have been different than they were represented as.
Do you have pictures of your caliper brackets? They're 50+ year old parts, so it's possible someone damaged the threads, or rethreaded them, or who knows what at this point.