Dazu Rock Carvings Museum sits near the Baodingshan circuit and is worth using as context rather than as a replacement for the cliffs. Its collection explains the main sites, including Baodingshan, Beishan, Shimenshan, and Nanshan.
The museum is especially useful if you are trying to understand the chronology and religious vocabulary before facing the carved panels outside. Check opening days before going; Monday closures are common for Chinese museums.