Wrong. Fundamental mistake.
The objectives of both organizations are vastly different. Though both are/were terrorist orgs - the distinction was clear.
1. LTTE wanted a Tamil Elam - period. Not a Hindu state etc. In fact Pravakaran and some others even converted to Christianity, asfaik. Boko Haram's objective is crystal clear - in their objectives, their manifesto, their motto, their targets, their specially chosen victims etc.
2. Boko Haram fights flying the banner of Islam. Now are they fighting for Islam? That's a tough question, but they believe they are. It matters not what you think. A dying man blown apart into two by a Boko Haram attack, or Christians or 'impure' Muslims slaughtered also won't be in a position to make the difference. On the other hand LTTE fought for land alone (using similar methods). But they did not fight for Hinduism at all. As for Boko Haram killing Muslims as well - well what do we see in the entire world? There is a concept of - good Muslim and bad Muslim. Some folks just can't tolerate a place without making it 'Pure'.