What do you mean "versions"? Are you referring to games region?
The 2 games I mentioned were Final Fantasy VIII - Disc 1 (US) and Chrono Cross - Disc 1 (US). They run perfectly.
The added 4 games were Castlevania SotN (EU), Resident Evil 2 (US), Resident Evil 3 (EU), Valkyrie Profile - Disc 1 (US), and Xenogears - Disc 1 (US).
I do think it's not about their regions, though.
I'd watched
@KMFDManic and
@PPlays 's tutorials, none of them mentioned about flashing again the kernel when using Dantheman's hakchi before press shift + Synchronize, so that's why I did not flash the kernel again.