I believe you are right. One way to spot these is the continuous
UUUUUUUUUdesign running above the belt rings. However I urge caution since one Omani variant has these as well: ...The Al Wustah Khanjar seen at
http://khanjar.om/Old.html
The hilt tends to be quite beefed up...thick... but the criss-cross wiring below the belt is usually over a felt backing and rather open. Most people get mixed up because it looks a bit like a Royal Omani Khanjar which is probably where the design originates but they are otherwise unrelated (except for the credible trade link). Omani Khanjars do not have a flower stamp on the reverse nor do they have Yemeni names inscribed.
A few weapons may have been made in Oman and imported to Saudia..where they may have been stamped with the bunch of flowers emblem, but regarding this how do we word the Khanjars name?... I think the general principal is based on where the majority are made... Dojanni sounds entirely plausible.
For years these weapons have been classed as Omani without proof or wrongly cited as such. Until Forum got stuck into the problem it was virtually impossible to even find a viable map of the region and let it also be noted that both regions have been hugely difficult to visit. In fact the area in the Asir went into virtual blackout for almost half a century, therefor, it is hardly surprising that difficulties were encountered...Al Ahsa Oasis region fared hardly any easier.
The local Omani name is Habaabi or "of Abha".