Can blue Yamacool be mixed with green Yamacool?

I've been told don't mix different types of coolants. Period. I know for sure going from something like Yamacool to a completely different type of coolant like Engine Ice can cause issues. But I don't know if I'm knowledgable enough to know how significant the differences are based off the colors alone. I think some brands use colors to designate different types of coolants while others, the color is arbitrary. It's more of a matter of what's on the labels than the colors.

Forgive me if I misunderstand but you're waiting for a part to arrive from the dealer to hopefully stop the leak, right? You'll be fine until then presuming that the dealership is going to flush your coolant.

Even if they don't, coolant flushing is so easy and you can do it yourself. I can run you through how I do the process if you go that route.