No, here is a complete GM listing:

https://www.midi.org/specifications-old/item/gm-level-1-sound-set

All GM synths will have the exact instrument lists, it is just the instrument will be slightly different. For example GM 57 is a trumpet and every GM synth will have a trumpet at number 57. But each trumpet may sound a little different depending on the trumpet patch used in each GM synth. The same thing happens on every other GM patch.

GM is simple to use in BiaB as BiaB is set up to use a GM synth. But generally speaking GM sounds are very poor compared to good non-GM synths. I'll bet that every sound on your Roland sounds better than most if not all GM equivalent sounds.

Using your Roland in BiaB requires a little more work. You have to assign each Roland instrument to the corresponding BiaB track. For example you must assign a Roland string sound/patch to BiaB's string track. Note I do not do this in BiaB so others will have to help you with this. But I do this with every BiaB MIDI track in my DAW as I find it easier to work this way. YMMV

IMHO to get superior sounds learn to use your Roland.

To get the most out of them, after you learn how to do the above, learn how to manipulate MIDI via CCs (continuous control), the mod wheel and the pitch wheel. MIDI can come alive with a little work.

We are all here to help you so don't be afraid to ask questions.

I hope this helps.

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