I've found a strong relationship between more greens in several environments, lighting can often be attributed to this. Under lower lighting they will often become lighter, or more translucent which shows off the greens better than the reds.
Lower flow in certain areas can also change the way they look, but this is often more of just what our eyes are seeing in comparison to actual changes in their color.
Cleaner water also can have a big affect different colorations, I have several of the same (came from the same mother 15 or so yrs ago) rainbow anemones in a smaller tank with extremely high nutrients and much dirtier water and after about 2 years they no longer have ANY greens, they are a darker red. All of these changes in color are often subtle and do not occur overnight but over time changes can definitely be seen. It is not uncommon for an anemone to look completely different from the initial piece you purchased after one year.
I am fairly certain at this point there is much less difference between Rose bubble tip anemones and rainbow bubble tip anemones than we are lead to believe, as they often look very different overtime once exposed to different environments.
One other thing, running higher whites certainly has an affect on coloration, colors often pop a little bit more, and become a bit deeper under a higher than standard white channel.
