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Yes, you can, because you have to.
See Oracle Support note:
*11gR2 Grid Infrastructure Redundant Interconnect and ora.cluster_interconnect.haip [ID 1210883.1]*
"At the time of this writing, *redundant private network requires different subnet for each network adapter*, for example, if eth1, eth2 and eth3 are used for private network, each should be on different subnet..."
No entry needed in /etc/hosts for private addresses. The installer will discover the interfaces accross the nodes, and you will be able to select the purpose of each interface (public, private, do not use).