>>56839399>>56839587>>56839787That's incorrect, SAR stand for Special Art Rare, which is what the Scarlet and Violet alternate art cards are called in Japan. SIR stands for Special Illustration Rare, which is the same thing but called in the international version.
>why bother calling them differentlyPrint quality difference, here's a webm comparing the same card as both an SAR and a SIR.