No, each kit is a big add-on that installs on top of a fresh, default OS3 partition. Each kit is specific and features different combinations of third-party apps and libraries. You can't install them all on a single system, it wouldn't make sense (and they would most certainly conflict with each others).
On the other hand, you can easily install each kit on its own system partition, especially under WinUAE. That can be convenient if you want to compare them to each other.
