Default [Q] What is the difference between allwinner a13- a13b??

Im having trouble with this, after my tab ended up having CWM Bootloop, what I want to know if its, ok to install the Fasstjb 4.2 rom which only works on Allwinner A13 processors?? but mine has A13b, will I try to install it?? or not? because when it fail again, I guess i'll be having a more complicated problem , I only want to resolve this problem before my wife's find out what I did to her Tab