Happens all the time.
Most of the regulars look at the destination sign, but others just don't have a clue. I know at the Junction they have two stands designated for the B41 - the first one is for the Kings Plaza B41, shared with the B103; the second is for the Bergen Beach B41s, shared with the Q35.
Usually, for my bus, after discharging at Avenue P, or bypassing it, I'll get on the PA and announce, "this is a 41 to Bergen Beach, next stop is 45th St.". I've had folks ride with me all the way to 71st Street, and I get on the PA and say "last stop", and they go outside looking for Kings Plaza, only to find residential houses, and a nice pizza place across the street. lmao! They ask me, "where's Kings Plaza?", I tell em, "you got on the wrong bus, guy. there's two B41 branches, and you got on the Bergen Beach one, not KP." I usually direct them to wait for the B3 around the corner that'll get them to the Plaza. It happens 60% of the time.
As for 9644, I've had that bus twice. Nice rocket.