This looks like Mi trying to satisfy the ego problems of Indian eCommerce giants by developing identical phones and making them that eComm exclusive.
Mi UI is the worst software ever
Symbion OS non-phones are better
It used to be,
Redmi [number]A, budget phone with lower spec
Redmi [number], the standard midrange spec redmi
Redmi Note [number], the upper mid range spec, bigger screen redmi
Redmi Note [number] Pro, the upper midrange spec, better camera, bigger storage and screen redmi.