I knew an eagle eye like yours would notice that on this pic! It's actually just the lighting, as all of the rose gold applied bits are even in color / tone in real life.
It's such and underrated model. (like the Cabaret) I'm out of town or I would have shown the 25th as well, instead I'll post an old shot 4 days off! ...
When these watches were produced Lange used to allow you to swap the hands out, they no longer allow it. Good catch btw, I didn’t notice the blue hands at first glance!