16U girls are bigger & stronger than 14U yet there are always exceptions, I gotta believe it's not going to be pretty when 14U teams try to play up I don't care how fast you throw it 3' for 14U girls will make a big difference that's why it's staying 40' for 14 & 12U, it turns it into a different game for them a Hitters game with more walks & hit batters.
The #2 & #3 pitchers on the 16U teams will have trouble, to get a preview of the spring attend a JV or Freshman HS game this year the pitching is going to be ugly at 43'
for that matter the Varsity level may turn into a hitters game ecept for those teams that have Gold pitchers who have been pitching at 43' that's why they are GOLD players.