Currently Being ModeratedMay 18, 2013 3:10 PM (in response to rocomendez)
No. They are the same for the same band of operation.
Currently Being ModeratedMay 18, 2013 9:29 PM (in response to rocomendez)
Does the Airport Extreme have a significantly wider range then the Express?
It all depends on what you mean by "signifcant".
The AirPort Extreme does have a better antenna design that typically will allow it to provide a bit better range. In tests that I've done here at the house, this typically translates to maybe another 5-10 feet or 2-3 meters of useable range.
Whether or not that is "signifcant" is your call. Keep in mind that every house is different, so your results cannot be predicted accurately.