mixing yellow and silver pins...

... any issues with mixing the yellow and silver dSub crimp pins?

I'm assuming the silver is the machined pin with some colored bands and the yellow is gold plated where the female version has a split. I use the machined ones when I can but have considered them interchangeable. But last night I had an avionics guy wiring the ADSB on my Navion find a broken wire to my SL-70 transponder. He had to re-pin it and the old one was the gold type. He tried to replace it with a machined pin which UPS typically uses but it didn't work. Fortunately I had some of the gold types and they did work. It was a typical 37 pin connector. Maybe the connector was just worn, maybe tolerances. Up until last night I would have said there was no fit/function difference.

Gold has higher corrosion resistance and lower conncetion reliability than nickel, which is usually used for power connections. They can be mixed otherwise.