I think the people who settled both regions, bringing the wheel, a language family, and other cultural structures probably left a common foundation that perhaps

I think the people who settled both regions, bringing the wheel, a language family, and other cultural structures probably left a common foundation that perhaps lead to further parallel development and/or facilitated cross fertilization. India had wide trade and cultural interchange between Southeast Asia, the Middle East, and even the eastern Mediterranean at least as far back back as Harrapan times.