Can't be universal. The size of the body size of the two mobile phones, thin, thick, wide and narrow are different, can not be universal.
OPPO Reno5 has a 6.43-inch OLED screen; Height about 159.1 mm, width about 73.4 mm, thickness about 7.9 mm,
The phone case is not universal, it is two different models of mobile phones, so the phone case is not used differently.