Check the title screen. Version 4.0 will display "v4.0" on the bottom right. If you see "v3.1" or lower, you have the old version.
The biggest complaint about difficulty hacks is the "grind." v4.0 addresses this aggressively. The game now features: download pokemon radical red v40 upd
It includes Pokémon from all generations (up to Generation 9, including Scarlet and Violet), modern abilities, the Fairy type, the Physical/Special split, and a difficulty curve that is notoriously brutal. It is designed for players who know their IVs from their EVs and understand complex type matchups. Check the title screen