Pakistan and India will play the Semi-Final but not together India's Under-19 team plays with South Africa's Under-19 team while the Pakistan Under-19 team plays against Australia, and this Under 19 Semi-Finals start tomorrow between India and South Africa and on Thursday we will see Pakistan Under-19 vs Australia Under-19, and I think on tomorrow's match India will win and on Thursday Pakistan will win, and if they both will win Semi-Final so we will Pak U19 vs Ind U19 at the finals.
Going in the history, In 2023 India A team and the Pakistan A team had a battle at the final of Asia Cup and that match was won by Pakistan, and Champions trophy final also had the same situation so maybe history will repeat or not, it's too much to think about at present.