Are front and rear 02's the same other than length of wire?
 

I recently did a heads/cam with whole bunch of other mods and it ran real rich before I got the exhaust on. I think the two 02 sensors in the car may have been fouled up with fuel. Can I swap the other 2 sensors that I no longer use since I'm not running cats? The only difference seems to be that they have different length wires.

Yes all four of them are interchangable.