Are 3G/3GS headphone jack flex cables interchangable?

[LongbowFoSho]

I've got a 3GS with a bad headphone flex cable. I have a couple of 3G headphone jacks laying around, yet there are a couple of sellers on eBay who claim that they aren't the same. They look identical to me (as well as in their own pictures). Its not like there's extra connectors like with the charging ports.

What say ye?

 

[Applejuiced]

I dont think they would work.

 

[LongbowFoSho]

Any idea why? All the buttons still function the same way on the two devices, right? I would imagine that the difference would be at the logic board, not the cable that carries the inputs.

I'm not disagreeing, just curious.