The Clair one - the "bronzer" side is a very light peach which barely shows up on my skin, I think it would make a nice blush but as for me, not much color payoff when I swatched.
On Chanel I have no idea what they used - it looked like the bronzer from the dark one and the highlight from the light one, but I think it's the darker one.
CHANEL Cruise 2019 makeup collection | Duo Bronze et Lumiere | First Impressions | Angela van Rose - YouTube
Here is a review from the darker one with the bronzer and the golden highlight. When she put it on to contour she was so positive about it and kept mentioning you've to use a very light hand, and all I kept thinking was I'm barely seeing any difference to your face and for using a light hand you sure are swirling your brush in there a lot. I'm hoping some other luxury make-up vloggers put up a video, photos can be deceiving.