Is there is any difference in the display clarity between Indian variant iphone and japan variant iphone
No bro. iPhones made in india are shipped globally. there is no difference in made in iPhone, made in China or Made in Vietnam. Apple factories follow same process and quality control.
But i used iphone 13 and 15 pro max both of them are buyed in japan but when i compared my phone with another same phone but indian variant i can see some clear difference between them. Both the phones are in same settings
normally there are two or three display manufacturers supply displays to apple factories bro. minor difference may be possible. but if you are seeing any quality difference like images are poor or video playback is in different colors, then its must to check with service center. they could possibly replace unit if display issue identified in diagnostics.
because color calibration and display quality wise they all are same. those minor color tone differences with display manufacturers are not noticeable easily.