For the ryzen 7 9700x I have the answer. Ryzen is the brand name, 7 is where it stacks up, the 7 in the 9700 says where it lines up vs other ryzen 7s in the 9000 series.

USB can suck a fat one.

The pro title is like the ‘performance’ version of cars. Sometimes it matters and there’s a lot of difference, Hyundai N is not the same as normal Hyundai. Sometimes it’s just a slight aesthetic difference. The title is to sell it not to be clear and accurate, normally. Some pro phones are definitely higher performing, others are almost identical.

I have no answers for Sony, outside of my area of knowledge, same for monitors.