No they are not the same. B/A is a B chord with the A in the bass. B7(9) means it is a B9 chord that includes both the flat 7th and the 9th note.

This should help:
https://www.fender.com/articles/chords/what-are-the-differences-between-b9-and-b7-9-chords


Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware