Hi Chris,
This is type of sword in Elgood's book, a 16th century "flamboyant" sword. This is also why I asked about your definition of "khukri". Attached is an illustration from Rawson's The Indian Sword. Are all khukri?
I would say they all share certain characteristics with the khukri, but only the Nepalese type, with its unique set of characteristics (the cho and kaudi, for example) is a khukri

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The swords in this frieze panel you showed is very similar to the flamboyant sword, but obviously much earlier, Rawson actually shows one on right column...compare to the adya katti.
Cheers,
Emanuel