He's not just some scrub off the street. He seems to be the best soldier they could find. So, no different than Sam, really, and they have Sam kicking dudes through airplanes and shyt.
Not really the same thing as Sam dealt with TWS (when he was evil), sparred with the rest of the Avengers in "Civil War", not to mention was in Wakanda when Thanos and his army attacked, etc.
Even if you could argue that new Cap has the same skill set and/or abilities as Sam....he has none of the experience.
Fred.