They do. And even if they boot, for example a NTSC J console for China does have a diferent magic gate key than a JP one so a JP utility disc will boot but will then crash in a black screen because the console can't decode the encrypted elf whick boots the disc.
Same reason why a european console will never boot a US HDD utility disc evebn with a modchip. A modded US console can boot a copy of the utility disc though
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)