Even though it sounds like the new HS is including the previous six semesters of courses and grades from the previous HS on the transcript, I agree with the others you should get an official transcript from the previous HS, plus their school profile (get that online or from the HS GC).
Ultimately, after applying, I encourage your S to reach out to each college admissions officer for his area and ask them what information would be most helpful to them, and how they want it sent to them.
Your S will likely have to enter his courses and grades in the common app and/or SRAR, so he will also need that info (exact names of courses from his old school, level, and grades).
Separately, it sounds like you are concerned about finances and scholarships, as so many people are. Colleges give by far the most scholarship money, while external scholarships are highly competitive and can require a lot of work for little payout. Some colleges will also decrease their financial aid package accordingly if the student does earn any external scholarships, and these scholarships often must be signed over directly to the college.
If you want college ideas where your son can get merit aid, let us know his stats and current list. It’s helpful to posters if we know whether you will qualify for need based aid. Each college should have a net price calculator on their website, do that for the college’s on your S’s list.