firstly, you can easily share swap between distro, that's not a problem at all, just tell each installer to use the same partition. as for other partitions and things, then yes, you'll need to allocate indivudal ones for most. depending the similarities in teh applications you intend to se on each, you can also potentially share /home between all systems, but of course your normal user would need to have the same GUI and GID on all systems to allow access to your own files across the board. also /boot can theoretically be shared between the distro's, as the contents of /boot is not actaully connected to the distro that installs it, it's just a system wide location to store kernel images etc... but to share it would be a manual process, not automated by an installer i don't think.
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