There would be no differentiation between any red coloured stone, star rubies are still red, so are garnets, agates, spinels, glass & plastic, the choice would be made upon availability of stones, personal preference & budget.
There would be absolutely no reason not to use a star ruby, if one was available, if the person concerned wanted it, & the money was available.
Colour is the dominant criterion.
There is a black stone that in Bali is called "Black Star" & "Black Star Sapphire", it is aluminium oxide, and quite cheap, this stone is sometimes used in keris dress & other places where a black stone is required.
I have not seen a red star sapphire used specifically in keris dress, but there are many things that do exist that I have not seen.
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