1940 ford front fenders

Can anyone tell me if their is any difference in 39 deluxe front fenders to 40 standard front fenders to 40/41 half ton front fenders and if their is how to spot them Can anyone help me Thanks

 

truck fenders are different from passenger car fenders. they look the same but they mount different

 

Do they mount different on the cab or running boards or both and is there any quick way of id them Thanks again