yes the sheet metal is interchangable between the 300 and the magnum for sure, and probably the charger, i parked my mag next to one and they look like the same front doors

 

charger front ends are not interswappable with 300s and magnums. Shame, cuz a charger front end would look perfect on a magnum. I don't like the 300 front ends on magnums all that much but the magnum front end on a 300 is interesting. I don't think it looks better but it does look different.