Hi all, i've been offered a second-hand IS200 head unit to replace me err3ed one. They both look identical (cd player at the bottom) although i have only seen a photo of the possible replacement. However, the code no on the front of each is different. The one from my IS200 S is 13901, whereas the replacement has a code 13902 on the front. Does anyone know what this difference may mean. is it possibly from an SE/SPORT and if so does that make it incompatible with my S.