Voice votes aren't taken by name, but by vote (yes or no, except it's England, so they say "content" or "not content"). All the yeses speak at once, then all the nos. Only those present may vote.
I think you may be hung up on what a Lord actually is in Parliament. Lords are individuals, not titles. A place in the peerage allows you to sit in the House of Lords. Sitting in the House lets you vote on legislation. The title itself does not grant votes, it only places one in the peerage. In that sense, voting wise, all Lords are equal, regardless of title or rank.