How does allotment work in HNI category of ipo?

how does allotment work in HNI category of ipo? Is it different from allotment process of retail investors?

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what is the difference between Non institutional investor and HNI?

High Networth Individual (HNI) - A retail investor who applies for an amount of more than Rs.2,00,000/- of shares in an IPO.

Non-Institutional investor (NII) - These include retail investors, NRIs, companies and trusts who bid for more than 2 lakhs. Non-institutional investors can bid an allocation of 15% of shares of the total issue size in book build of IPO’s