I will take a stance that your sons are just completing 8th grade since you said they were looking forward to HS ball.
And it looks like they aren't shaving yet. That is good 
Find a good gym/workout program/baseball pitcher specific trainer. I can't stress this enough. Son went to "where the other players were working out" in 9th grade and got his first injury. I squashed that workout place and got him to go to another that was sport specific. It makes a difference.
I've been on the boards for about 10 years and there was a poster quite a while back that also had twins. As you read through the posts, you will learn about 'counters' in scholarships, and this poster had an interesting situation where both boys were going to the same school but only one was getting a scholarship. This helps the team in "counters", and may not reflect negatively on the one son's abilities at all, and could help you in a big way. I know of a similar situation with brothers on the same team. All that is a bit down the road, but thought I would just mention it.
And welcome!