You're asking a couple of questions at the same time here.
2021 vs. 2020 and 2 ports vs. 6 ports.
The 2020 and 2021 cars are all capable of making the same amount of power. All of the fast/high-powered 2020s have swapped 6-port heads.
Honestly, removing the passenger seat takes 5-10 minutes tops. It's way easier to remove it, and just lay on your back with your feet in the hatch.
It'll shave like 45 minutes off the job.
As someone who spends way too much time on here, you def need to turn off all your email notifications. It's in your settings/account/profile whatever.