Since the dream MUST make sense to the dreamer, I'd say that you have figured out the symbols.....as our intuition as to their potential meanings...due to our own life's experience, is the best way to go.
When I first read it, I thought"Two toned" = "duality".......or two, rather then one.
But the mitigation in the dream being the "laying neatly in place" sounds quite positive .
IF as you say, "the older hair is orange"......and the newer hair brown, and this was noticed by you, as "older & newer" as in the contrast showed in the dream, then this is saying
Older (is the old thoughts and conditioning, which you kept for years perhaps) vs Newer and new thoughts which you are forming in your consciousness.
Interesting dream.

Deb.