What is the difference between a Sallen-Key Band pass filter and a band pass filter?
There are lots of circuits that are band pass filters.

A Sallen-Key bandpass is just one of these circuits. 

As compared to a passive filter, the Sallen-Key filter, like many active filter types, will be less affected by loading.

A Sallen-Key bandpass filter will be only a 1st-order filter (two poles, but generally the order of a bandpass filter is half the total number of poles).