Boulder Ridge is the original
DVC wing of WL (used to be called the Villas at Wilderness Lodge). Boulder Ridge is a separate building, connected to the main lodge via an outdoor breezeway. Copper Creek is the "new" DVC wing at WL, and is comprised of former hotel rooms converted to DVC villas and situated entirely within Wilderness Lodge proper.
BR has no separate eating locations, but DOES have it's own pool (although any cash or DVC guest at WL can use it). Copper Creek shares the main WL pool (also called the Copper Creek Pool) with the hotel. Copper Creek is closer to the food locations because it's in the main lodge, but also does not have any dedicated restaurants. Copper Creek also encompasses the stand-alone cabins along the Bay Lake shoreline.
Copper Creek is much newer and “fresher”, although BR is “scheduled” for a refurb this year.