IOS devices, the 3 screen resolutions

iphone4, 4s, ipod 4th gen
ipad 1 and 2
3Gs , ipod 3rg gen (3rd gen 16+ gig only right?)
1) Within these three matching resolution catagory's, can i assume an app will always layout identical?
To elaborate, if i have an app with retina display running on the ipod 4th generation, there is no reason it will not layout identical on the iphone 4 or 4s right?
Same for ipad 1 vs ipad2 ? Are there any surprises here?
2) I want to get an app ready for the 3gs, it has been designed around retina display.
While testing on an iphone4, if i export the app as  "low resolution" and fake the values otherwise assigned by capabilities.screenresolutionX + screenresolutionY.  + DPI
Is this a good way to prepare for a non retina display device?
It's the same physical size screen, if with low resolution it auto scales to 480x320 (if thats correct), then can i assume layout/testing should be more or less the same on 3gs vs iphone4 without using retina display? (i do not have access to a 3gs currenty)
3) what is the value returned by capabilities.screenDPI on the 3gs
thank you

Try resetting the device (hold the home and power keys down until the Apple logo appears ).
Barry

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