Ok, if you gave explicit instruction to each player to fix their starting point in those positions to adhere to as rigidly as possible, then you could claim they were different systems, but most of the time that's not how it works and for good reason.
In all three of them, Gerrard would be playing further forward than Masch. In option 4, Benayoun would be more of a drifter between the lines, and wouldn't do as much tracking back - Gerrard would though, because that's one of his main strengths, so the result would be two equivalent systems of play. Unless as I say, you choose to tell Benny to alter his natural game and play as the fulcrum of the attack alongside Gerrard, which just isn't his game, so why would you?
The final option would end up with more or less the same pattern as 2 and 4, Kuyt would come deep because that's his natural game.
You'd see:
<---Kuyt -->
Torres
more than (or as much as) you'd see:
Torres Kuyt