This is my first thread on Banjo Theories
So, the different looking and colored eggs definitely exist in BT.
But after all, what's the point of having new eggs if you can't transfer them back to BK? In my opinion DK64 seems like the only possible alternative.
And there's the fact that most of the time the eggs just crash or glitch up the game, and even when they are present the game gets severely slowed down. Whatever was its purpose, that feature must've been scraped very early in development.
There you have. Go nuts fellow theorizers!
PS: Theorizer is actually a word.