Actually I was able to replicate the portal functions with "--parameters" by following:
https://learn.microsoft.com/en-us/cli/azure/backup/restore?view=azure-cli-latest
And then adding the "VirtualMachineName", "VirtualNetwork", and "VirtualNetworkResourceGroup" params / overrides.
az deployment group create \
--subscription $subscription \
--resource-group $toResourceGroup \
--name $restoreName \
--template-uri "$url?$token" \
--parameters VirtualMachineName=$restoreVMName \
--parameters VirtualNetwork=$vnetName \
--parameters VirtualNetworkResourceGroup=$toResourceGroup
Hope this helps anyone else, thank you!