24 bit monster HP patch

Sorry to be a hassle. But does this patch work with 1.0, 1.1 or both? I know the ROM must be headered (mine is a 1.0 headered). But when I hex edit the Guard at 0FD150 to 01, the guard still has just 40 HP and dies with 1 fire beam attack.

Also will expanding my ROM effect this in any way? I have expanded it to 28-bit. Just wondering why it's having issues. Thanks!

I've included the code below as well. I will note that these did all appear as FF as noted earlier. I don't expect this had anything to do with this issue though.