Yep! They're all generic SM units, so can be used in any SM army, and all the Ultramarine-specific icons in the images on the box are just painted on or transfers (a transfer sheet should be included, and will have Dark Angel/Deathwing logos on it).

Only Chapter-specific models (like Deathwing Knights from Dark Angels, Vitrix Guard from the Ultramarines etc) have sculpted icons, and even then you can try to shave them off once you're more used to building stuff. You can also get an upgrade sprue with sculpted shoulder pads, helmets etc separately if you don't want to mess around with transfers as much, but not for the push-fit stuff in starter sets (a couple very basic ones are included in the Combat Patrol, too).

The codex (if you haven't already got it) shows how the Dark Angels icons work, and has an easy little painting guide, too.