I have a feeling they are different as the Badge off the IS Mesh grille is an awkward part to order where as the emblem off your car is easily sorted. That may sound odd but i can't figure out how else to put it!!!!!
Part Number for a MKI Sport "L" Grille Badge is 75431-30220 and they retail at about £11.
Badge for IS Mesh Grille would probably take a couple of days just to get a price and part number, sorry.