AUSTIN, Texas — Jason Wang and Johnny Truong were part of a gang that dressed as utility workers and held a suburban Dallas homeowner at gunpoint, making off with $68,000 in cash, electronics and jewelry before they were eventually caught. Although both were minors, the law treated them very differently because Wang was 15 and Truong was 17, setting their adult lives on very different courses. Wang went to a juvenile lockup where he took classes that eventually helped him earn a college scholarship. Truong …