Yes, they will find out that it is already suspended, and yes, it can be suspended longer. A conviction of MIP (B&P 25662) requires the court to suspend your license for a year. However, you may have another problem ... chances are you have probation conditions from the first DUI - if you are lucky there is no specific alcohol prohibition. But, in any event, you could find that your probation has been violated and you could face jail time for the original DUI for committing a new offense.
Consult local counsel.
- Carl