Relay for a NH 650

The relays in my junction box are hit and miss.

I cross referenced the part number on the actual relay and found the same relay for a chevy truck.

I purchased that relay and it didnt work...

 

The part number from Case is 47802977

 

 

I guess my main question is why would the chevy relay work if the number on the relay is the same?

Relay for a NH 650