Sadly, it would take significantly more work to do on a 3rd-gen, in particular some rewiring to bypass the stock relay and use a new relay in it's place with the power run directly from the battery.
The way that the 3rd gen fogs work is that the high beams are an on-on relay... When your highs are off, the relay coil is deenergized, and so the power runs from the high-beam relay to the fog light relay, and then to the fogs themselves. When you flick the highs on, the coil energizes, pulling the switch in the relay (and therefore the power) to the high-beam circuit and cutting power to the fogs. The fog relay stays engaged, though, just with no power running through it.
You'd have to wire up another relay that takes power from the battery and uses the signal from the stock switch to energize the coil.
HTH.