Thai vs Boran? Key differences?

I'm looking at heading to Thailand to train next summer, probably at Tiger Muay Thai's training camp (its a post grad holiday for myself)



They offer Muay Thai, Boxing, Krabi Krabong, Brazilian Jiujitsu and Muay Boran.



I don't know a great deal about Boran, since my experience of it is Ong Bak (taken with many pinches of salt) and from descriptions given to me (its like Muay Thai, but has a more self defense attitude than a sport, also got headbutts)



any key differences I should know about? I'd be out there about 2 months and want to know as much as possible