Is there really a difference in physical appearance between Northern and Southern Vietnam?

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From what I see on YouTube, Hanoi and Ho Chi Minh City don't seem that different.
But I feel like I've heard stories that they are different once you go into the countryside.
To be honest, if you mixed them randomly, I think it would be hard to tell them apart exactly.
If anyone has traveled extensively in Northern and Southern Vietnam, please let me know.