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If you select the correct macbook then you get these specs
Module Size: 1GB
Package: 200-pin SODIMM
Feature: DDR2 PC2-5300
Specs: DDR2 PC2-5300 CL=5 Unbuffered NON-ECC DDR2-667 1.8V 128Meg x 64
Compared to
Module Size: 2GB
Package: 200-pin SODIMM
Feature: DDR2 PC2-5300
Specs: DDR2 PC2-5300 CL=5 Unbuffered NON-ECC DDR2-667 1.8V 256Meg x 64
So apart from the size difference it is the same RAM. Cruical says the maximum for your macbook is 2GDs but i believe that to be wrong with the limit being 3GB.