Wifi repeater from ISP? - eviltoast

Hi so my parents ISP provided a wifi repeater I have in the photo, they have the default router and wondering if this extra router (Asus RT-AC68U) i have would work better?

https://imgur.com/a/Tqdez0K

I have changed the firmware on it to work as a normal router, and would this work with the repeater by default or would I need to do something extra?