The realme Supervooc 120W charger supports SuperVOOC technology, which is also used by OnePlus. Therefore, you can charge your OnePlus 13 with this charger. However, since the OnePlus 13 typically supports up to 100W, it will likely charge at the maximum speed of 100W instead of using the full 120W. The charging time should therefore be similar to a 100W charger.