Well there’s an issue here. “Till” is informally an abbreviated version of until. So yes, in that sense they are the same.
Wait till I get there! / Wait until I get there!
(Both right, you just sound like a hick the first time)
However “till” is also it’s own word. It means a few things.
Cash register: “The robber told him to open the till and give him all the money or he’d shoot!”
To turn the ground in order to farm: “After winter ends, farmers rush to till their fields.”
