OK, so I tried finding the Pointers for GTA3, but all I have been able to get done is the Money Cheat, and thanks to another User, get the "Unlock Weapons at Hideout" Cheat. Other than that, it seems the Possible Codes for Health, Armor, Ammo and No Reloads will not work.
So either the Pointers are incorrect, or they need a certain Register Value.
Memory Dump is for this Specific Version (from a Switch-### Site)
TitleID - 0516DBB748970000
BuildID - 56e7b8f33024d194
Version - 1.0
https://mega.nz/file/zEd22JqZ#z8cLllu9hqJhaA3BIvJW7cc5b7d_Ojak7VZ95jQGgNI
So either the Pointers are incorrect, or they need a certain Register Value.
Memory Dump is for this Specific Version (from a Switch-### Site)
TitleID - 0516DBB748970000
BuildID - 56e7b8f33024d194
Version - 1.0
https://mega.nz/file/zEd22JqZ#z8cLllu9hqJhaA3BIvJW7cc5b7d_Ojak7VZ95jQGgNI