The ate pin has a larger end which is driven into the hole in the caliper. It must be driven out with a drift or a large nail to change the pads. The other calipers have loose pins secured by a small hairpin through the end.
I don't think they would easily be interchanged so perhaps one came loose and rubbed against something.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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