I'm not sure to have understood the question. The program executed are the same, the only difference is in the engine-setup plugins called that
performs additional initialization for the data domain and those plugins are in the all-in-one subpackage of ovirt-engine-setup.
The only difference I'm aware of in calling ovirt-host-deploy is that on AIO the automatic configuration of the firewall is disabled because it's
already done by the setup.
>
> Gianluca