Jeep TJ 4.0 O2 Sensor question

[Freshly Minted Georgian!]

ok, I did a kinda dumb thing. Bought an 03 Jeep TJ a few months back. As with all properly running Jeep TJ's, the check engine light was on. Took it to the parts store, they slapped on a reader and told me one of the two upstream O2 sensors was bad. I bought from them, new Bosch #13687. I didn't write down which specific upstream it was, the code is now gone. I'm guessing this particular Bosch part is probably the same for both of them but is there a way to tell? Should I just wait for the error to come back?

By the way, runs pretty good. Gets horrible mileage, probably 12ish MPG, but it runs pretty good. Engine is the 4.0L

 

[CAMSDADDY]

I have a 97 with a 2.5 and I get 13. Im guessing the light went out or the code would still be present. I would drive it until it returns. Looking at the Napa 13687 is bank one sensor one and bank two sensor two.

 

[Kyzrsoze]

This how Rockauto has them listed: