That's the magnitude of new detected infections. Pakistan has conducted 1/4th tests per-capita compared to India. 1/6th for Bangladesh. So I don't think there's much to see there. I'm comparing the inflection points and curves on the graphs.
Cross-border leakage with Bangladesh? Possibly. With Pakistan? Hardly.
All of these countries require a recent negative test prior to arrival. The Central Asian countries show inflection at pretty much the same time, barring Uzbekistan which is a week late. However, India has a lot more relative traffic going on with Sri Lanka and they and Maldives, both South of India, inflected a whole month later.