Help with a High School rule

[NorCalRef12]

Here are the NCAA interpretations:

I. Airborne A1 receives a legal forward pass one yard within the
opponent’s end zone. As A1 receives the ball, he is contacted by B1
and first comes to the ground with the catch at the one-yard line,
where the ball is declared dead. RULING: Touchdown (Rule 8-2-
1-a).
II. Airborne A1 receives a legal forward pass one yard within Team B’s
end zone. As A1 receives the ball, he is contacted by B1 and first
comes to the ground, on his feet, with the catch at the one-yard line.
After he regains his balance, he runs and is downed at Team B’s
five-yard line. RULING: Not a touchdown. Team A’s ball at the spot
where the ball is declared dead.

The difference between the two is when the ball is declared dead. In the second one, if the official rules that forward progress was stopped in the end zone, the result is still a touchdown.

NCAA 4-1-3a A live ball becomes dead and an official shall sound his whistle
or declare it dead: When it goes out of bounds other than a kick that scores a field goal aftertouching the uprights or crossbar, when a ball carrier is out of bounds,
or when a ball carrier is so held that his forward progress is stopped.
When in question, the ball is dead (A.R. 4-2-1-II).

NCAA 5-1-3a. The most forward point of the ball when declared dead
between the end lines shall be the determining point in measuring distance
gained or lost by either team during any down. The ball always shall be
placed with its length axis parallel to the sideline before measuring (A.R.
8-2-1-I-IV) (Exception: When an airborne pass receiver of either team
completes a catch inbounds after an opponent has driven him backward and
the ball is declared dead at the spot of the catch, the forward progress is
where the player received the ball) (Rule 4-1-3-p) (A.R. 5-1-3-I, III, IV and
VI, and A.R. 7-3-6-VI).

I'm not seeing a big difference between the rule sets. It's just the judgement of the official as to where progress is and whether forward progress is stopped.