iPod5 screenshots resolution issue

Hello there,

Today I got this email from Apple:

....

If you are updating your app for iPhone 5 and iPod touch (5th generation), you must provide additional screenshots to support the new screen dimensions for the App Store.

The new screenshot dimensions are:

• 640 x 1136 (portrait)
• 640 x 1096 (portrait)
• 1136 x 640 (landscape)
• 1136 x 600 (landscape)

Ok, my question is:

Why on iPod the resolution changes from landscape to portrait?

I mean, if the portrait resolution is 640x1096 I expect that the landscape resolution is 1096x640 and not 1136x600.

In fact for the iPhone5 the resolution is 640x1136 portrait and 1136x640 landscape.

Can be this an error?

Or someone can confirm that iPod5 changes resolution from portrait to landscape?

Thanks in advance