Are they really using the old rotary engines? The only DC3s I've seen still flying were turboprop conversions with noticeably different engine nacelles of cours

Are they really using the old rotary engines? The only DC3s I've seen still flying were turboprop conversions with noticeably different engine nacelles of course. Never seen them for passengers but there was a geo survey company operating in the area that used them. Really cool aircraft to see.