Answer: In most cases they are, but they don't have to be.
Most of the enamel work we do involves painting the door trim the same color as the door. It is appropriate at times to split it however. Depending on the color and room decor you can paint the doors a different color and it looks fantastic. If you choose to do this it is very important to speak with a designer. You can do this for free and your only cost will be having the painting done professionally. I'd also strongly recommend you have a professional do the painting work. There is a difference in quality and knowledge.
Also, I don't recommend splitting windows. It's too busy and defeats one of the purposes of having a window there.
Call Nick with Complete Custom Painting: 651-336-0561 cellular