While machines such as the elliptical do know the specifics of the speed and resistance settings you are using (while Spark uses just broad averages), machines are also notorious for significantly overestimating the calories burned.
Unless you were using quite high resistance settings, I would go with the more conservative of the two estimates.
In the context of 1450 calories over a week, 100 calories is probably less than the margin of error inherent in the estimates anyway. Not something to get worried about.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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