Here is my point again, just for you and Elixir who loves to ditto your posts, like some latter-day
Taggart.
Yes, the big cartridge on the right is what an AR15 fires, but also what this rifle fires.
And thus will have similar muzzle velocity and similar carnage should you be hit with a bullet fired by it.
They both even have semi-auto action. But one is a scary "assault" weapon, while the other is not.
Same goes for 7.62x39mm cartridge. Two rifles firing it will have similar ballistics, but not all will be scary-looking AK47s or similar.