fork component interchangeability?!

[Bretty]

My front fork has developed a bit or a knock or play, it's hard to describe.

Anyway, I've picked up another set of forks to switch them over.

The knackered set on my bike have preload adjusters
The older pair I've just got don't have preload adjusters (older?).

Is it possible to swap the preload adjusters over to the good fork? Or are a lot of the internals different?

Thank you,

Brett