Do any of the members have naturally high or low voices?

I was looking at some older posts about the members vocals and saw a few people say that Sunoo has a naturally high voice which kind of surprised me because I really love how his voice sounds when he sings lower parts. Obviously that doesn’t mean he doesn’t have a naturally high voice and because I don’t know anything about singing I’m not going to say those people were wrong, but since some of these posts were from years ago I didn’t know how accurate they were. I know some people have said that Ni-ki is forcing his voice to be lower, but I am still assuming he has the naturally lowest voice in the group. Does naturally low or high voice just mean they are tenors, baritones, etc.? Do some members have a naturally high or low voice? Or do they all have normal male voice ranges?