Every vehicle in GTA V, 887 of them, with the spawn name FiveM uses for each one, grouped into 23 classes. On a server with ESX or QBCore an admin spawns one with /car followed by the spawn name; in a script, the name or its hash goes to CreateVehicle. Open a class for the photo, the make, the DLC pack and the model hash of each vehicle.
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is the vehicle's model name: the <modelName> in its vehicles.meta, and the name of its .yft model file. The game turns it into a hash (joaat, GetHashKey in Lua) to load the model, so a script can use the name or the hash.
On a server with ESX or QBCore, an admin types /car followed by the spawn name, for example /car adder. Other frameworks and admin menus have their own command. In a script: RequestModel with the hash, wait until HasModelLoaded is true, then CreateVehicle.
From the add-on itself: it is the <modelName> in the vehicles.meta inside the resource, and it matches the .yft file in its stream folder. A car built in the Vehicle Creator gets the spawn name you choose when you download it.
It is the internal name of the game pack that defines the vehicle, as it appears in the game files: mpsum2, mpheist4 and so on. TitleUpdate means the vehicle is defined in the game's main update files, which is where most of the original GTA V vehicles are.
Natives identify a model by its hash: the joaat of the spawn name, shown here in hexadecimal. In a FiveM Lua script, GetHashKey('adder') and `adder` (between backticks) both give it.