by updates to the headlights do you mean a slight design change? I've never noticed, I should pay better attention. The fog lights are pretty simple, they might have changed the bulbs to a higher power rating or maybe added a high power ballast? I am pretty sure the front bumpers on all C70s were the same so I don't think they would go thru the trouble of changing the fog lamps and have to change the mounting brackets. You could do a search for C70 fog lamps on Ebay and the seller of a set might have a cross referencing data-base on their add that you could use to check, just a thought.
I've been thinking about changing mine to HID but I've spent quite a bit on other parts to get mine up to date on service.
It is also extremely easy to add aftermarket fog lights of the same diameter in the holes. The mounting distance is some nominal dimension so the ones I bought just mounted right to the factory bracket. I thought they looked very nice with the jewel headlights, I never even wired them up. Plus they were only $30 for the pair.
I was gonna get around to it, I swear! I even picked factory plugs out of a junkyard car so I could wire them in without hacking the harness, I just only drove this car in nice weather and the jewels are so nice I never needed more light.
But I won't apologize for how cheap I was, because screw paying $180 or whatever for factory foglights!