RK was huge in overseas. From what we've seen, it was at another level.
While SRK has had a lot more consistent success, and sustained for a huge time.
Plus, as BOI said at the time of Dangal, it's not just about the success of one movie, but whether that market can be set up as a consistent source of income, and this decade particularly we've seen many other stars getting good numbers, which means these markets are fully established for Bollywood, while RK's success in China and Russia was limited.
no to mention, every single SRK movie, even the hugely rejected movies, go over $10m overseas.