If you plead guilty or nolo contendre to the first ticket, it is done and you likely cannot reopen that charge. If you were close to the end of your deferred on the first charge, it is possible that the second ticket will not appear before the first is cleared. Hire a traffic ticket attorney that can either get the second ticket dismissed or delay resolution until the deferred on the first ticket is completed.
Wow, you speed when you are lost in Houston?! I guess you were in a hurry to figure out where you were?
Look at the terms of your deferred adjudication and you will learn the answer.
It is highly doubtful your license will be suspended.