Wow, disregard my previous comment about Wise not composing those rock boss songs then
Also, I'm thinking that quite probably Yamamoto was only involved on a supervisory level and wasn't really the one who composed the Rocketbarrel theme. I've come to think these days that DKC Returns is mostly Hamano, and maybe she also did the non-rock bosses from Tropical Freeze (Mountaintop Tussle, Triple Trouble, Fugu Face-Off), and probably Secret Seclusion as well (doesn't really sound like Wise to me).
But then again, there are multiple Nintendo composers credited on both games, so who really knows what did each one do.