Are you talking about the light orange patches on the back of the shrimp as I can't see any 'white'??
I have had red chrerry shrimp that have a lighter colour stripe along its back, so similar.
If your shrimp are only a few days old then they may just be getting back to their normal colour as they settle into a new environment and the different water parameters. The shrimp may also be about to molt due to the change of water?
I don't think you need to worry at this point, but just keep an eye on it.
The nearest I came up with from the disease thread was muscular necrosis, but it doesn't look quite right for that to me?