ECU hardware difference

[DonArm]

Does anyone know if there is any differecne in 02 WRX ECUs ?
I have one that i bought a few years ago and had the original Cobb Accessecu reflash on it to save the stock one in case I needed any warrenty work done.
I had the original ECU out the other day lokking at it and notice that the ID numbers were different than the used one I bought. The original is an AF423 the used one is an AF421.
Oh, and when I run the ecuexplorer program it shows the number of the used one as AF411.

Don

[cboles]

I doubt there is much hardware difference. If you remove the case and look at the numbers and take pictures of the PCB, we can know for sure. I have a few AF423's here for comparison.

Colby