Unless the two types of barrels are next to each other, telling them apart can certainly be a challenge, if not impossible.
One thing that stands out in my mind is that there are sometimes minute imperfections in the SSK Krome application that look like small (really small) round indentions similar to air bubbles that have been present and then popped (like in a painted surface). You must look very carefully to see them. Over time, these small indentions or pits, if not cleaned regularly or sufficiently, will collect just enough oil/particulates/stuff in them to be darker than the surrounding finish, making them easier to see. These imperfections are the vast exception rather than the rule, you may never see any at all in the SSK Krome finishes you run into. I do happen to own one like that and I have seen one other SSK barrel with those imperfections - but they still shoot like a million bucks and the small cosmetic anomalies sure won't get me to part with my SSK barrel (you know what they say about prying it from cold, dead fingers!). :grin:
Good and safe shooting to you.
Javelina