Odd piston color

[jojo-munson]

Hey all, I pulled the heads off my 72 c20 with a 350 due to it blowing white smoke, bubbling in the radiator, and lots of milky gunk under the valve covers. So I figured I had a blown head gasket. When I got the heads off, my numbers 5 and 6 pistons are a different color than the rest. I'm assuming this is a side effect of the head gasket leaking and coolant getting in there. Is this anything I need to worry about? Or should I be okay with slapping the re-machined heads back on with fresh gaskets?