For comparison: If replace HDD with installed Xubuntu to other PC, Xubuntu will work correctly on different hardware. It's checked.
If replace HDD with Slitaz - on boot error appears: KERNEL PANIC.
If manually copy files of installed Slitaz (of couse without content of /proc/ /sys/ /media/ /mnt/ /tmp/ /var/) from HDD to other HDD, and manually install GRUB -
The result will be the same (kernel panic) OR (in some PCs) Slitaz loaded into the console and ask login. GUI (slim) not started.
How to clone tuned (with installed applications and new kernel) Slitaz to other PC?