All of these Islamic groups follow the same book, share the same goal, believe most devoutly. This makes sense.
Boko Haram Re-Brands as Islamic State in West Africa, CSP, by Nicholas Hanlon, April 23, 2015 ;(thanks to Counter Jihad Report)
There is a lot of relatively good news on the progress of the Nigerian army in it’s efforts to defeat Boko Haram. Here is where all of the nit-picking about the differences between IS and Boko Haram will mean even less. Boko Haram was lionized for it’s ability to take and hold territory. However, because of it’s primary driver as an internationally connected Islamist group that is ideologically driven, it will adapt to a new menu of tactics that resemble Al Shabaab.