Yes, that is the only compatible type. I'd also strongly encourage you to avoid "cheaping out" on RAM. Apple machines are notoriously picky about RAM. Choose something from a first-tier manufacturer. I bought cheaper RAM for my PowerBook and it ended up making the machine horridly unstable. I returned it for a refund and bought the slightly more expensive Samsung RAM which has been perfect to this day.
Moral of the story? Treat your PowerBook right and it'll treat you right.