For FAA License u will have to go to USA , Do a one week refresher course and take the exam again , shuould not be a problem , would not be much different than the exam you would take , . well for dgca , same thing , u will need to sit the exam to convert your examinations.
if you can pass one exam you can pass all , its not rocket science , if your conecpts are clear you will be fine , no matter where u are taking the test , so be very attentive during the course , know this disptach thing inside-out!