Identity-based habits offer a framework through which to view your goals. The 3 R's of habit change provide a plan for achieving your new identity. Combining both of these ideas can make change easier for you overall.
In other words, identity-based habits keep you focused on the right things: like starting small, building your identity, and not worrying about results. Meanwhile, the 3 R's of habit change make sure that you do things in the right way: like linking your new habit to a current behavior and rewarding yourself for a job well done.