Not much to be honest.
DMI is with two driver managers. They ask competency based questions, also question why you want to join, what’s your motivation, what research have you done etc etc
MMI is usually done with someone from HR/ recruitment and they literally drill down on the six questions that you cover briefly in written form at the end of the paper exercises on the assessment centre
Everything is generally completed with the STAR format and if you search this forum thoroughly everything is there to help and assist you to within an inch of your life!
Good Luck