Centrino 2 "Montevina" refers to a chipset for the entire system, made by Intel. While the new Macbooks and Macbook Pro's use the same Core 2 Duo, Penryn processors as computers with the "Montevina" chipset, they are using a chipset that is made by nVidia instead.
So they are using that same CPU as Centrino 2 computers, but using a different system chipset.