rb shifter?

[rtsol]

ok, i know the ka, ca, and sr shifters are all interchangable. does that include the rb too? im still debating between the ca18det and the rb25det. i already have a B&M shifter for the ka(thats the transmission im using) but i need to know if it wiil fit the rb? or maybe more specifically, will the rb bell housing bolt on the ka transmission? any help will be appreciated. thanks