Door ASM Pause Screen Map Palette Edit

[Mettyk25jigsaw]

Hi, I am wondering if there is a way of making the door ASM make the room the door loads use a different palette row in association with the pause screen map?

In other words when entering a door using the door asm ptr, it makes the next room load different colours on the pause screen map with the map tiles.

Is this just a simple piece of ASM to write? I hope so.

Any help would be greatly appreciated, thankyou...