Its absolutely fine to go with a different door style. A real colonial/early american 19th c. house often has different doorstyles throughout anyway, ranked on whether the room was "public" or "private", first floor or upper floors, or even by importance in the same room.

This reminds me of that house that had two front doors from having been a duplex; remember that one? If there's a main door and French doors on the same facade, there's nothing wrong with having the front door in a distinctive color to act as a signpost. If they are old french doors with super-narrow stiles then all the more reason to treat them with the window sash color. Casey

Spanish cedar is fairly soft for a door. It's equivalent to white pine. It dents very easily. I would suggest Sapelle instead, it should be the same cost or perhaps a bit cheaper; the good Spanish Cedar has become hard to find. It was "plentiful and cheap" 10 years ago. Anyway, both of these woods exhibit wavy grain patterns that can create blotchiness. I would stain on top of a sealer coat to prevent this. Make sure the stain is light-fast (no dyes; earth pigments only) But with an exterior exposure you need a top coat with the highest amount of UV protection, so you aren't having to revarnish every year. With a top-quality varnish you can extend this to three years between re-coats. If you wait too long it will have to be stripped and start fresh. Aside: sapelle is quite a bit darker than Sp. Ced. to begin with, and a small amount of color will render an amazing mahgany or walnut color. Casey

I think it is a personal decision. I would paint the screen door the same color as the solid door.