AMD has definitely been moving in that direction, and arguably doing a better job of it than Intel. But for now, AMD's desktop parts are still built with the same CPU core chiplets as their server parts, and none of the server parts are using heterogenous cores yet (from AMD or Intel). At some point AMD could theoretically build a desktop processor from one Zen chiplet and one Zen-c chiplet, but there hasn't been a good reason to do that yet.