pioneer avic F840Bt vs f940bt
 

Hello

Been offered the Avic f840bt for a really good price out of a subaru BRZ, been told its the OEM version of the F940bt. Wondering if anyone could confirm this? It's going to be going in my 05 blob wrx. I have a sub I'm wanting to run only difference I can see is I'll have to buy a RCA port to fit into the back as the 940 already had this any Info would be appreciated