Hey Chris, welcome to the forum!
The first thing I recommend anyone check when purchasing a used CrossFire is whether it will run using Mach3 (Gen1 machine) or FireControl (Gen2 machine). There are cosmetic differences between the CNC control boxes that indicate which software to use. Mach3 CrossFire machines have colorful blue, green, red, and yellow markings around the ports on the control box whereas FireControl CrossFire machines have more simple white and burgundy markings around the ports.
Regarding whether you have the older S45 or the newer X45 torch, remove the consumables from the torch and match them up to the pictures of the consumables that we have on our webstore. Don’t pay too much mind to the cosmetic appearance of the body of the torch, the consumables are more important.
Edit: typo
Tomws Added tags: Gen1 vs Gen2, Gen 1 vs Gen 2, Original vs Firecontrol