Hello,
I cannot speak for the EMT-B BUT I can say that the medic recert was slightly different than the old written "initial" exams to get into NREMT. I don't know if you took the CBT for your initial cert or not.
Do some reading on this site and see what others have posted. There are no specific questions from the tests posted BUT there is some good info on how the tests are structured.
My gut instinct would be that the same book is ok to study from. I used my medic book to study for my recert and it worked out just fine.
Wy medic