Just curious as to why you would want the wall and trim the same color? Do you have any example pictures?

They used to do this all the time, years ago. When I bought this house (built in 66 or 68), the trim in the bedrooms was painted white, but, it was a terrible paint job, and peeling everywhere. Underneath, you could see the color the trim had been, and in every bedroom, it matched the color of what the walls were once. I dont see that done much anymore.