I believe it is the same, however, there are different classes of name check. As far as I know, for most countries, US embassies ask for an Eagle class namecheck which is not very comprehensive or it has a high priority. For some others, they do a regular name check which takes a long time. However, namechecks requrests which come from embassies always have a higher priority compared to those USCIS asks. Even if you see lottery samples, those who win and apply for greencard thru an embassy get processed faster than those who ask for change of status within US.