I would say it depends on which studio put the release on iTunes. The one on sale is from MGM, not Arrow (that's not to say that it isn't the same transfer). For example, I bought the Arrow release of the Japanese movie Pulse (which is no longer available for purchase). The one available on iTunes now is from Magnolia. It's my understanding that they are different transfers. I personally don't know that this is true since I haven't and probably won't repurchase it. There is a like a second or two difference in the running time, but this is probably from each studio adding their logo to the opening credits.
So, in short, I don't think there's really any way of knowing without buying it.
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