https://qph.fs.quoracdn.net/main-qim...917f936a1.webp
This picture exists for a reason. Although exaggerated with the explanation, the faces in that picture are relatively common for their respective regions. From afar, most indians will look like brown blobs but if you observe their features, facial metrics, skin texture, head sizes, and other factors closely there are huge differences.
I have not been to punjab but I have been to rajasthan and western UP. South indians in these areas stand out quite easily.