PCSX2 identifies cheat files by a unique CRC (Cyclic Redundancy Check) number, not by the game title. Launch PCSX2. Boot your game. Look at the (or the top window bar).
The transition from Armax to PNACH involves two primary stages: decryption and formatting. Decryption armax to pnach
Here's a step-by-step guide to converting ARMAX to PNACH using MATLAB: PCSX2 identifies cheat files by a unique CRC