Yes, I think both of our pics are from the same event. Captions often cause confusion and to add even more, here is a link to a Getty pic showing HRH with Sultan Qaboos at the banquet - showing the date as 01 Dec 1981!
However, the Monarchy's webpage Inward State visits since 1952 lists the dates as 16-19 March 1982 which is confirmed by other Getty photos of the visit.
I'm happy to hear that you will be adding even more lesser-seen photos from your archives.