Are the left and right downstream O2 sensors different?

[CO4x499]

Denso's site is showing:

-Downstream 11.77": 234-4209
-Downstream 9.5": 234-4260

Rock Auto site only shows me one:

-Denso: 234-4260

I'm rather confused. I need to replace both sides.

 

[CO4x499]

 

[CO4x499]

 

[xtremewlr]

OEM maybe different but it will only be the length of the wires. The Denso O2s are the same for both sides and are what you want to get.