Is the 85W adapter backwards compatible?

I've got three laptops amongst my family. Two MacBooks(13") and a MacBook Pro(17" Core 2 Duo). I'm about to buy a few spare AC adapters for the laptops, but there seems to be a 60W and an 85W version.
If I buy the 85W AC adapter, will it work with all the MacBook and MacBook Pro laptops?

The 85W power adapter designed for the MBP will work with both the MBP and MB. However, the 60W adapter that came with the MB should NOT be used with an MBP.

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