when comparing versions, the colors depend on the direction of the comparison, i.e., new changes are green and modified code is red.
For example, I just accidentally compared v1.9.1 on the left to 1.9.0 on the right, and took me a minute to realize someone didn't overwrite changes, they are just reversed -- a swap button would be nice here.
gitlab has this feature for code comparisons:
I have just shared this with our engineering team. I don't have a timeline yet when this will be looked at but will be in touch in this thread here when I have news on this 