I was just coming back to post that I figured out what I needed.
(Changes Network Adapter already present)
Get-Cluster %cluster_name% |Get-VM |Get-NetworkAdapter |Set-NetworkAdapter -NetworkName DR_Private -Confirm:$false
(Adds New Network Adapter to CLUSTER)
Get-Cluster %cluster_name% |Get-VM |New-NetworkAdapter -NetworkName DR_Private -StartConnected -Confirm:$false
-Brian