I figured maybe this comparison would help someone out there. Urban Decay Naked is warmer than Chanel Topkapi, but they have some similarities.
Urban Decay Half Baked is a rusty warm gold. The gold in Topkapi is more of a true gold with a bunch of shimmer.
Smog is pretty similar to the bronze in Topkapi, but Topkapi is still a bit cooler in tone.
Urban Decay Darkhorse is a deep brown. Chanel Topkapi is more of a blackened brown. It also is more pigmented than Darkhorse.
Urban Decay Sidecar is a beige taupe with annoying glitter fallout. Chanel Topkapi is a cooler toned, and lighter taupe.
Would I give up either of these palettes? Of course not!!