My bro just finished his conversion this weekend(berk intake set). The panther doesnt extend as far into the boat, but I do believe the insert box for the panther is wider than the berk , which requires some glass work to the floor & transom.
Edit- Performance (all other things left alone) should be much improved with lots of upside. If you want speed, find an intake with a bolt on shoe.
Panther conversion: Id avoid it. You could source a complete pump with diverter for under a thousand bux (used)and do the glass work yourself, saving a boatload compared to the conversion.