I don't see the problem with having music that feels like it belonged to the B-K serie. After all, Yooka-Laylee is a spiritual successor made by the people that made Banjo-Kazooie so it's a given some features will be similar. The music is one, I really like the Jungle World theme and yes it sounds like it belongs in a B-K title but that is good to me, the style Grant Kirkhope developped for these game is unique and one of my favorite, I think it's been missing for too long and pretty glad it will make a comeback in Yooka-Laylee. I guess maybe I should remove my nostalgia goggles but... it's how I feel about it.
Also, don't forget David Wise is also making the music, so there will be his style as well.