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hi Murphy
Newts are a bit more prone to things moving about - the mirrors are often held in relatively flimsy structures and the tubes can flex and sag - particularly near the focuser - as the attitude varies. If your guide scope is solid and your Newtonian flexes about, you will have odd star shapes, since the guide scope might be pointing where you want it, but the Newtonian may be pointing where it wants to. If you use an OAG, it will not matter. Of course, you can buy Newtonians where everything is bolted down - CF tubes, heavy spiders, multiple strengthening rings etc, but the run of the mill ones are not like that.
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