dusk background challenge

I have some talking head footage that was shot in late afternoon an office in front of a window. Of course, about 15-20 minutes into the 2 hour shoot, the light had completely gone.

Is there a way to convincingly match the backgrounds of the clips? I've seen a lot of day for night info but nothing about just the exterior background in an interview. The lighting is absolutely great on the subjects themselves, in case that is helpful.

Thanks in advance,

J