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The links are broken in your post. However, it's hard to tell without knowing the model of Powerbook you have.

In general though, Patiman is right. Powerbooks that take PC2100 will also take PC2700.
Here is the Samsug original Datamem part

http://www.datamem.com/viewcat.asp_Q_C_E_1153
1GB 200 Pin DDR PC2700 333Mhz 128x64 CL 2.5 SODIMM All Mac & PC's (Samsung Original) DM50 155 $149.00
 
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