What CD-filesystem comes with Squirrel scsi?
But anyway, you can have several cd-filesystems installed on your system and you can then switch whatever you want to use of them. Just make backup copy of the cd0/cd1/etc files from devs:dosdrivers/ or sys:storage/dosdrivers/ before installing a new filesystem.
For example, I have several dosdrivers for cd:s in my sys:storage/dosdrivers/ dir:
CD0asim (L:asimcdfs with atapi.device)
CD0asimscsi (L:asimcdfs with 1230scsi.device)
CD0cbm (L:CDFileSystem)
CD0amicdfs (L:AmiCDFileSystem)
CD0 (L:CacheCDFS)
etc...
It's just that they're using different filesystem from L: and/or different device. Open those driver files with texteditor and see

You can then mount whichever you want or drag wanted one to devs:dosdrivers/.