DB4 downgrade

[Cheng-Jih Chen]

Because of the sudden end-of-life of Fedora Core 4, I'm moving my mail 
server from FC4 to a CentOS 4.4 box.

FC4 uses DB4 4.3.27.

CentOS 4.4 uses DB4 4.2.52.

What's the best way for me to downgrade the Cyrus DBs for this migration?

Thanks.