Ah, ok! Yep, sounds like two different names for the same thing.
Hmmm... I learned "stringers" from my step-dad when I was building sheds and barns with him in MT, but he was from the mid-west, so I'm guessing that's where the different terms came from... dunno.
Just googled the two terms and yours is described in the way it should be and mine means the support boards (the up/down ones supporting the platform of each stair)for staircases. Interesting. I guess I needed to learn something else new this weekend!