Maybe, for the most part Fanuc g-code is compatible with Linuxcnc. Where you are most likely to run afoul would be with M-codes and tool change codes, canned cycles and how subroutines are handled. There are almost as many different ways Fanuc controls can be set up for g-code as there are machine tool builders who use Fanuc controls. The specific g-code dialect is almost all ways different in some way from one builder to the next.
But even if your post's code isn't exactly what is needed for Linuxcnc, you probably can write a simple script to convert it on the fly as it is loaded into Linuxcnc. It is configured in the "Filter" section of your ini file.
linuxcnc.org/docs/stable/html/config/ini...html#_filter_section
