In the Super Mario RPG OST, the 32th track is Let's Race: https://youtu.be/rZidnhxErBc?si=CYlkYPFLrxYgJ1CM, while in the Undertale OST, the 32th track is Run!: https://youtu.be/XLxNMt-2qMU. Similar in themes - fast paced, competitive, and hurrying. Also, since Sans and Papyrus are often depicted to be Wario and Waluigi (the Wa- counterparts of Mario and Luigi) respectively by fans, and that the most popular trio in both franchises are respectively Sans, Papyrus, and Undyne, and Mario, Luigi, and Yoshi. Yoshi himself also has a Wa-counterpart in Super Mario RPG - Boshi. In Undertale, Run! is Undyne's theme, and in Super Mario RPG, this track, Let's Race, is Boshi's theme. Both characters also show a somewhat aggressive behaviour, equip armour, are covered in scales (Undyne is a fish monster while Boshi is a dinosaur), and share a blue colour scheme. This therefore proves that Undyne is Boshi, just like how Sans is Wario and Papyrus is Waluigi.