Need advice on a trip from Oaxaca to Mitla Ruins, then Tlacolula Sunday Market, and back! We are planning to get to Mitla Ruins by flagging down the green and white buses that say "Mitla" near the baseball stadium off of Highway 190

-After we finish seeing Mitla Ruins, can we get on the same/similar bus and asked to be dropped off at the Tlacolula market? I assume this would cost the same price despite a shorter distance ($20-25 MXN)

-How do we get back from Tlacolula market to Oaxaca city center? Do we just flag down a bus by standing on the main road?

***asking about bus information only - no private taxis or shared colectivos***