No. On the exams where the two are stocked separately — which is nearly all of them — the demo is its own short sample rather than a slice cut out of the Premium set. What it reproduces faithfully is the sitting; what it cannot reproduce is the ground Premium covers.
The assumption behind the question is a fair one, since a free sample can easily be a piece cut out of the paid thing. Here the demo is built as its own object, written to the same rules but scoped to a single representative sitting, which is why it tells you a great deal about how a timed networking certification exam simulation treats you and very little about the ground you will be covering afterwards.
What the Demo and Premium Sittings Share
The machinery, in almost every respect you can feel. A clock that behaves the same way. Items and their options arranged afresh for each attempt. Movement back through the items already passed, so an answer you were unsure of can be revised. A score at the end, covering the items you have just answered, and the same marked review of each item underneath it. And the same drafting rules: the evidence lives in the prompt rather than in your memory, a wrong option is wrong for a reason you could state out loud rather than for being obviously silly, and an item marked as a single unit is either right in full or not right at all. The one thing that does not carry across is what happens if you walk away — an unfinished Premium session is still there when you come back, though the clock it comes back with is a full one, and an unfinished demo attempt is not there at all.