The external drive is detailed as 5700 RPM. There internal drive you have linked is 7200 RPM. Either newegg has incorrect details listed or the internal drive you linked is not what is inside this, probably the latter.
Yup, you're right. Now that I think about it, I recall reading that Toshiba's only using the lower-speed HDDs on their externals right now. That would make this a DT01ABA300, perhaps?