mixed system

[ray]

My ubuntu is a mixed system, it means, most of packages are from breezy, but
a few packages are from dapper. If I want to install a package p1 from
breezy,  and p1 depends on package p2,  and p2 has been installed  but it is
from dapper, I don't want to downgrade p2 to lower version from breezy and
also don't want to install p1 from dapper. Can I install two  versions of
p2, one from breezy, one from dapper? What should I do? TIA.
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