Am currently doing an assignment on sine wave generation and am using a sallen key band pass filter - i am unsure what the difference between the band pass filter and the sallen-key band pass.
There is no such thing as a "normal" bandpass filter - only different topologies. For instance alternative filters might be biquad or multiple feedback.
A Sallen-Key is widely used because (unlike the biquad, for instance) you can construct it using a single op-amp. The Sallen-Key is also useful because its design equations are simple.
If there is any bandpass which is "normal", in the sense of the most widely used, it's probably the Sallen-Key. A biquad has better sensitivity to component variations and the parameters gain, center frequency and Q are much more independent. That is, it's much easier to adjust a single variable than with a Sallen-Key. It also requires 3 or 4 op-amps to the Sallen-Key's one.
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).