They should coordinate in style and match in color. A lot of mouldings these days have become very simple, such as those in photo 2. That straight line look goes well with a transitional or contemporary look, while the more ornate mouldings in photo 1 work better in a traditional style home.
Carolyn Albert-Kincl, ASID https://www.houzz.com/photos/upper-hall-contemporary-hall-toronto-phvw-vp~443574

Thank you! We are in the middle of painting EVERYTHING and I'm kind of overwhelmed with all of the trim now that the molding is finished. It might have to stay for now and get painted in increments along the way.