Sorry missed that (always write me an email, when you need a quick reply
).
As far as I know there are no different versions of the Bytekiller decrunch routine. There is just the usual one.
You can use trackdisk.asm (td_loadcr) from the Solid Gold source for reference. Or loader.asm. Although these were modified to decrunch on the fly, while loading block after block from disk.