[snazz]

In theory it's 15W and 15W, but both chips can use more than that amount under certain circumstances and the AMD chip can even be configured by OEMs with different TDPs. Plus they heat up differently under the same workloads due to different chip features and optimizations (as the sibling comment mentioned).

[hajile]

To my knowledge, the only AMD chips approved for fanless designs are their 5-6w embedded chips and the same is true for Intel.

Those chips usually have 3.5-4GHz turbos, but in a fanless config, you'll never see them (and even with active cooling, you won't see them for more than a handful of seconds).

[qayxc]

Power curves and C-state handling is also performed by the firmware, which is again controlled by the OEM/ODM not the chipmaker.