When deploying soa components into to a cluster in soa 11g using ant do we need to deploy in 2 nodes (if we have 2 node environments)?

As per my knowledge, we don't need to do any additional configurations for this and not required to deploy in 2 nodes.

Used developed ant scripts for non-clustered environments also work in clustered environment also. If deploy the codes in single node soa_server1. The default coherence rule of Web logic replicates the deployment to all the nodes under a cluster; hence it was deployed to second soa_server2 instance automatically.