There really is no such thing as an International Model.
Here are the models of iPhone 15 Pro Max Model around the world:
A2849 (United States, Puerto Rico)
A3105 (Canada, Guam, Japan, Mexico, Saudi Arabia, and U.S. Virgin Islands)
A3108 (China mainland, Hong Kong, Macao)
A3106 (other countries and regions)
If you purchase a model A3105, which is sold in Saudi Arabia, you should check with your carrier in India to ensure it is compatible with them.
But be advised that iPhone warranty is NOT international. If you buy your phone in Saudi Arabia, your phone will have NO WARRANTY in India. And India is well known for not helping people who didn't buy their phone in India. This means if you have any issue with the phone, you'll need to take the phone back to Saudi Arabia for service or warranty repair.