As I am watching Powerplay for the first time, Rebecca and Diane's apartments look so similar.

Not really...They look VERY different. I love Diane's apartment! It looks so cozy!

Theres like a window in Diane's apartment...the kitchen is moved back more...her room is where around the area where rebecca's front door is. Dianes front door is where rebecca's kitchen door is...different colors...funiture..design....I mean I'm sure they used some of the stuff in Diane's apartment when they did Rebecca's...but it doesn't look anything alike.

It's probably the same set....they just modified it. I'm just guessing.