You don't need to.
If you really want a green rudder and green nose, go for it. I simply suggest caution. Lots of caution. Lots and lots of caution. Lest we get in the same boat we just got out of.
Just because it has a different number in the name doesn't make it all that distinct from the unit 1 number up or down. (I'm not going to start a war on that. I'm right, technically speaking. I'm not talking about individuals or the history of the units -- I'm talking looking at the skins list in the hangar and making a choice) We want to make it distinctive.
Look at the cookie cutter P-47s we had for a while, eh? Mostly the same except for a yellow ring around the star, or a red ring, or a blue ring. What about all the zeros with nearly identical markings (only difference being the tail stripe)? I think visual distinctiveness is JUST as important as the name of the unit that goes with it. I can probably list a dozen P-40E skins of different units that all fall into the same color scheme, or even identical markings save for the tail codes.
You cannot have a skin for every unit that used a certain plane. There were more planes used in the war than we'd ever be able to skin. You have to draw a line, correct? Logically, the solution then is to balance different units with different markings, don't you think? That way when 2 skins are next to each other on the runway, or in-flight, they are distinct from each other at a glance. In addition to having different units. That way, logically, you not only get visual diversity, you get unit diversity as well.
I'm not saying you're wrong Fencer. I'm just saying the unit alone can't be the only thing considered. It's a total package deal.