I'm sure you know this but I am posting this here for anyone reading it, sharing of the special chip roms is not allowed here on the forums, they fall under the same rules as regular roms and bios files.
All the special chip files you need are included in the No-Intro SNES set, you will just need to do like you said you did in your post, copy and rename files.
https://docs.libretro.com/library/bsnes_accuracy/