No, you're inferring a generation from the number in a way that you can't.
i5-4200U is a 4th generation cpu from Q3/2013
i7-940XM is a 1st generation cpu from 3 years earlier, with an older architecture and "fab" dimension. (note 3-digit numbering).
The first digit relates (roughly) to the generation, but not in the case of the three-digit number.
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