Hey guys, let me back track a bit....I did some digging and checked with our automotive group. Keep in mind that I work for the company that essentially invented all this technology in the first place.
Here is the problem....you don't really know what is in one bottle vs the other and HOAT ingredient packages have evolved.
From a practical stand point, don't mix coolants and you will likely be best served using what the manual recommends.
I would even avoid mixing different brands. Not all yellow, or green, or orange is the same although they all belong to the same groups of products. Though I would not panic.
Mixing green with yellow or orange is likely a bigger problem than say mixing orange with yellow. But again, best to not mix.
Most HOAT is really similar to OAT with the addition of silica based corrosion inhibitors. Silica is mostly designed for aluminum corrosion inhibition but it can precipitate and cause issues if the proper chemistry is not maintained.