>>11885182>JPThe 1.0 version of the game contains a few minor bugs but is the baseline.
>NAEffectively the 1.1 version of the game but with a twist, the game in most ways has been made harder to the JP release, most notably the knife does roughly half the damage to the JP release, the incendiary grenade seems to do less damage, ammo drops far more frequently (meaning less money), a few sections have increased enemy counts such as the village bell fight, some other minor changes like a typewriter before the double garador fight being removed. Overall a slightly more difficult experience but not significantly so, except for the Krauser fight which due to the halved knife damage is a lot harder to cheese.
>PALSo this basically combines the NA and JP releases, keeping all the bug fixes of the NA release but keeping the JP difficulty, this version would be the baseline for all future ports and releases. In my opinion it's by far the easiest of the 3 as it also includes some changes to weapon stats, some are cheaper or stronger don't remember the exact values of the top of my head but you can find them easy enough.
There's a ton of little things I left out like how no NA release even the later ones until the new steam release had "Easy Mode" and a bunch of version specific glitches or the censorship of certain regions, most notably JP and Germany. Another is how the NA release changed the names of certain enemies to the PAL release so Gatling Man is now J.J. and Chainsaw Man is Doctor Salvador.
I don't thing anyone has made a comprehensive list of every single change between regions and ports but there's a lot and about 95% of them barely matter.