[CecilOne]

I will only comment on NFHS vs. USA. They have become more alike lately.


I have the same need. Here is the list of notes I used last year. Be sure to eliminate those that no longer apply like IP award, pitching move timing; and add damaged bats.
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NFHS Rules Difference Highlights vs. USA
Lineup – initial, penalty for correction or unreported
head coaches verify that their players are legally and properly equipped.
Double 1st permitted, not required
Catcher box 10’
Line removal penalty
Bat grips and knobs, warm up bats
Catcher helmet
Uniforms –solid color under, caps, hair control, 6”number, religious/medical, weather, coaches
NO jewelry, taped or not
No shorthanded start
The restricted player is not allowed to leave the bench/dugout for the remainder of the game.
The home coach shall decide whether the grounds and other conditions are suitable to start
Pitcher on top of plate, may step back until hands separate
An illegal pitch is only a ball on the batter, no awarded advance by runners
On deck only their side
Head coach ejected for altered bat, along with the out and player ejected
Holding the bat in the strike zone is considered a bunt attempt
Intentional walk
Running lane
LBR pitcher control
CR - In the top of the first inning only, the pitcher and catcher are identified as those players listed on the lineup as the pitcher and catcher; both must face at least the first batter on defense (one pitch).

For the States our Association covers:
The Run Ahead rule is 10 after 5 (or the usual abut 4 1/2) for all NFHS games, regardless of State, Conference or League.

The magenta ones are either no longer different or some aspect has changed.