Can anyone tell me what the difference in these two modules is and how to tell which one should actually be installed in my car? Also how can I test the shocks to know if they are still working correctly for the CATS system can they be tested with an Ohm meter?

JAGUAR S TYPE ADAPTIVE DAMPING CONTROL MODULE
2R83-5A496-AB
XR83-5A496-AE

Thank You

 

2r83 is for cars built after 6/2002
xr83 is for 1999-6/2002.