Is there a new specification for Edexcel Geography B?

I have 2 text books and im struggling to choose which one to revise from. One of them is orange and it says on the cover "New edition for the linear GCSE course certificated from 2014" the other one is green and doesn't say that. The orange doesn't have developing and developed case studies for volcanos while the green one does.. Instead (I think) the orange text book has case studies such as Montserrat and Iceland's Laki eruption; these aren't noted as developing or developed. Is this a new specification? I really need advice as I can't afford to study something that will not come up in the exam..