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I wasn't sure about the pyrex, but they aren't the same scope. Skywatcher dobs are made by Synta in China, not GSO in Taiwan. The mount is different (has adjustable tension on the alt), and in the ad in the current AS&T they come with a straight through finder as standard, not right-angle.
I agree that there is unlikely to be any significant optical differences though.
By the way, my Astro Systems barlowed laser collimator isn't an ordinary laser collimator used with a barlow (does that make any sense?!). I would agree that a Cheshire sight/tube is fine and a standard laser can only do part of the collimation that a Cheshire can do. Just make sure the sight tube is long enough to focus on the cross hairs, which the Andrews one I bought isn't.
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