If they're clad in metal, they would be paintable, yes?

Do the Bronze door and window even match? Most manufacturers don't. And absolutely not do you mix a Bronze/Bonze door wit Bronze/White Windows. Honestly that will look like a**.

It will be fine. Look at photos on Houzz and you'll see you never noticed before. Lots of houses have white windows inside and the sliders are bronze or black, because most sliders are one color inside and out.

The only slider product I know that can be truly 2 colors is the high end Marvin clad products that can be customized.

I went with Euro-wall bronze sliders and I had the option of a paint-able wood cladding on the inside ... sounded good ... but it isn't perfect since you can still see the bronze frame. If I had seen one in person before ordering, I probably would have just done the bronze on the inside.

No different than having all white interior windows and having a wood stained front door ... no one says that looks bad! The bronze sliders will blend in in the same way.

The only slider product I know that can be truly 2 colors is the high end Marvin clad products that can be customized.

My PGT sliders are two colors. Bronze exterior and white interior. Same with my windows.

I think you need to do a bit of looking at different window makers to see what you can get . I think bronze inside makes all the rest of the choices inside more complicated and so inned to understand why bronze and not black for instance.

Thank you for your opinion. The builder doesn’t offer black as a choice.

Chispa-
The builder I’m sure won’t offer me a custom made slider. They are made of aluminum so I could get the white out/white in and paint the outside bronze. the slider wouldn’t be directly exposed to weather, 14’ back from yard/house - picture a big U and slider is on the curve portion.
Just thinking it will have to be white/white slider to match inside. If the slider was iron and black I think possibly it could work with mixed casing colors. 🤔