Can I share files between dual-boot Snow Leopard and Leopard partitions?

Apparently one of the cool new features of Snow Leopard is its file system compression. That has me wondering though, if I want to have a single drive with two partitions and install Snow Leopard on one partition and Leopard one the other will I be able to mount the SL partition from Leopard and read/edit files without causing problems?
It seems like that would not be possible but I thought I'd throw it out here to see if anyone has tried.

As far as I can tell, Apple has applied compression to most of the system executable files in Snow Leopard. However they do not appear to apply it to data files for any applications that I have looked at.
Apples documentation for ditto (go to terminal and type "man ditto" at the prompt, without the quotes) states:
--hfsCompression
When copying files or extracting content from an archive, if the destination is an HFS+
volume that supports compression, all the content will be compressed if appropriate. >This
is only supported on Mac OS X 10.6 or later, and is only intended to be used in >installa-tion installation
tion and backup scenarios that involve system files. Since files using HFS+ compression
are not readable on versions of Mac OS X earlier than 10.6, this flag should not be >used
when dealing with non-system files or other user-generated content.

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