I still meet J-1s who think the I-901 SEVIS fee and the MRV visa fee are the same thing, but they’re separate payments for different systems. Keep both receipts handy — consular officers sometimes ask for the I-901 tied to your SEVIS ID on the DS-2019, and I’ve seen 9 a.m. appointments derailed over that tiny detail, so I’m flagging it to spare you the stress.