SANTA CLARA, Calif. — With three games left in the regular season, the high-scoring, star-filled 49ers are hosting an AFC juggernaut in a potential Super Bowl preview. That scenario played out in 1994, against the Chargers on the 49ers’ way to their most recent Lombardi Trophy. That also could describe the 49ers’ current path. On Monday night, the NFC-leading 49ers (11-3) welcome the AFC-leading Baltimore Ravens (11-3) as Christmas guests at Levi’s Stadium. Both teams are positioned as the No. 1 seed for their respective conference playoffs that begin next month, with a potential rematch in st…