only one thing i know...pentatonic scale is different from the "blues" scale...the blues scale has 2 extra notes?
blues has one extra note.
when you play the A minor blues scale like this :
----------------------------5--8------
-----------------------5--8-----------
-----------------5--7--8-------------
-------------5--7---------------------
-----5--6--7-------------------------
-5--8---------------------------------
theres is the 6th fret on the 5th string, and the 7th fret on the 3rd string, which makes two notes that you dont play when you play a similar pentatonic. thats cos this scale is two octaves of the blues scale, and therefore the one extra note is played twice