You're missing this entry from your .11 box:
ACCEPT tcp -- anywhere anywhere state NEW tcp
dpt:postgres
So iptables goes right to the end and then rejects with "Host Prohibited"
which is reported on your .13 box as "No route to host"
I think the command you want on your .11 box is:
/sbin/iptables --insert RH-Firewall-1-INPUT 19 --protocol tcp
--destination-port 5432 -j ACCEPT
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