Such gorgeously perfect shades of taupe. Need to go add a request in Wish Lists for a similar shade in the middle of these 2. I think I'm a little too fair to wear Catalyst as much more than a liner.

I just saw some swatches of these two and I see that Catalyst is a bit darker than I first thought. Still really want them though I think for me it wouldn't be a crease colour either, definitely a liner and maybe on the outer third if I was daring.
Couldn't you maybe decant a little bit of both into another jar and make your own middle shade? Not sure what would happen with their finishes being different though...