Looks like Krastorio2 needs these tiles to function

Oh? Interesting. I did not realise this. Can you tell me the error you get without them?

After a bit of poking, I think I found a setting in the k2 mod settings that enables/dissables k1 flooring tiles - is this what is causing the issue for you?

I did not change any value like this (left the default value), so if it is set to enabled it might need this tinted concrete and thus crash?

What is the setting you are talking about?

In settings -> mods - startup -> krastorio 2, there's an innocuous setting called "Include some items from KL" that I think depends upon the tinted concretes existing.

oh, that one, I have it disabled as per default.