I think you just need to come out for the vintage ride in the fall. Should be an opportunity to swap bikes for a few miles.
I should note that I ride clips & straps (with slotted cleats) on my Raleighs, so you'd need to be able to handle that.

At John Haboush's ride in 2019, I did a quick swap with Dan M. He was riding his Raleigh Pro and I was on my Hetchins. His Pro was a tad big for me, but it was still interesting to ride it. Not sure that I detected anything that distinguished it from my International, though...
The Pro was certainly in nice shape...



Steve in Peoria