Are the iphone 4s and 4 the exact same?

Are they the same brightness and res or is one better than the other is it worth upgrafing from 4 to 4s for this?

Why would they recreate the exact same iPhone. Of course not
The iPhone 4S's hardware is a complete upgrade from the iPhone 4. It is in the same category as the iPhone 4S, iPod Touch 5, iPhone 5, iPhone 5S/C.
The iPhone 4S has a dual core A5 chip which is way faster than the iPhone 4.
The iPhone 4S also has retina display meaning better resolution on the screen(more pixels)
I would say the upgrade is much worth it. The iPhone 4S is a great phone.

Well all you need to know is that the iPhone 4 doesn't have Siri but the iPhone 4s does.

No they are not the same. There are many features extra as well as new processor in 4s.
you can check in any mobile comparison site.

4S is better

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