Tambourine should probably hold a decent or large advantage in power, considering him oneshotting Kuririn without meaning to (even if you factor in Kuririn likely having some fatigue) and being referred to as several times stronger than someone who Goku seemed impressed in Yajirobe easily killing. If Roshi can make the best of his good moveset such as the Bankoku Bikkuri Sho and Yoiko Minmin-ken whilst keeping Tambourine at a distance though, he still has a chance at overcoming him through superior technique. Karin did bring up Daimao being able to kill Roshi as a means of showing how Goku would be helpless despite Roshi being far weaker than Goku, making it evident how revered Roshi's capabilities still were.