Replaced heartBeat NIC need any configuration changes ?

You can use the 'vcw' wizard to reconfig heartbeats.

Extract from VCS Admin Guide:

p. 430: About modifying the cluster configuration

This chapter describes how to modify and delete a cluster configuration using the VCS Configuration wizard. The chapter also describes how to enable and disable Veritas Security Services in clusters configured to run in secure mode.
Use the VCS Configuration Wizard (VCW) to modify and delete a cluster configuration. When used to modify a cluster configuration, the wizard
performs the following tasks:
■Adds nodes to a cluster
■Remove nodes from a cluster
■Reconfigures the private network and LLT
■Reconfigures Veritas Security Services
■Configures the ClusterService service group in the cluster
When used to delete a cluster configuration, the wizard removes the cluster components from the nodes; the wizard does not uninstall VCS.