My understanding is that the only difference in the 2 carbs is jet size, '08 has a 190 main, '03 has a 195 mainThat’s for a 2008. I would assume they are the same, but if you pull up a carb for 2003 they aren’t offered. If they were the same wouldn’t it show available?
Months ago I ordered a new VTX1300 carb from the closest online OEM Honda warehouse I know of (Bellaire Ohio, I think). It showed available so I happily ordered it & a day or 2 after the transaction went through I got an email saying that item is no longer made/available, $$ refunded.