Yes, but that's not the problem. The SNES buttons "Select and L" don't exist on this collection at all. In the 4 SNES/SFC games, some combination of "R, Y,B,X,A" buttons also don't exist. So I can map the Switch button to anything I want (both in game and on the UI), but it can never be one of those "forbidden" buttons, as they were removed from the emulation.
Japanese Darius Twin: No buttons can be mapped to be SNES Select, L, R, Y or B.
American Darius Twin: No buttons can be mapped to be SNES Select, L, R, X or A.
Super Nova/ Darius Force (from here on out just called Darius Force): No buttons can be mapped to be SNES Select, L, X or A.
Switch -: hardcoded to bring up the menu of the collection itself
Switch +: hardcoded to Start* in all games in this collection. (*Pause- SMS, Run- PC Engine)
Switch button SNES button
L: can be changed L: cannot be mapped in any of the 4 SNES games
R: can be changed R: can only be mapped in Darius Force
ZL: can be changed Select: cannot be mapped in any of the 4 SNES games
ZR: can be changed Start: hardcoded to Switch + button, can also be mapped as a duplicate on any Switch button besides -, Home or Capture
Y: can be changed Y: cannot be mapped in Japanese Darius Twin
B: can be changed B: cannot be mapped in Japanese Darius Twin
X: can be changed X: cannot be mapped in Darius Force or American Darius Twin
A: can be changed A: cannot be mapped in Darius Force or American Darius Twin
Also, not that it matters for this issue, but the (S)NES/ (S)Famicom Nintendo Online controllers cannot be remapped in the UI, so "Select" on the SNES controller will ALWAYS be "collection menu" on this compilation.