This is a very vague phrase. Samsung manufactured more than 10 different model numbers of the "Galaxy S10", so there are many "international models".
But regardless, no, you cannot flash the firmware of ANY other Galaxy S10 model, even if it also has a Qualcomm processor
I see, but I don't understand why is it not possible? I saw many people saying it was possible, even some people saying they changed from UK FW to the Nepal