Can you explain the context of these two PRs in more detail? I looked at both and quite frankly don't understand. (For instance, "just" the top level CMakeLists.txt is not enough to do anything, since it includes pybind11Tools, etc.)

Yes indeed, more than the CmakeLists is needed here.

Why are there two PRs, and how are they related? What is this trying to accomplish?

The goal of the other PR is to implement what was described in #652 i.e. enable the inclusion of the pybind11Config.cmake files in the conda package so that people building upon pybind11 who use the conda package can use find_package

I have updated the other PR for it to fetch the tarball from GH archives, and unlike the pypi tarball, it has everything that is needed.

ok, sounds good!