Both O2 sensors are 4 wire. One wire sensors will NOT work. And yes, the front and rear are different part numbers. Some have had good luck using universal 4 wire O2 sensors in both locations. You can roll the dice and try it and if it doesn't work use a factory original part.

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.