There might be a discrepancy if you use an OBC-NCL certificate from Bihar during counselling for BTech admissions in Gujarat if your domicile is Gujarat.

OBC-NCL benefits are state-specific in India. An OBC-NCL certificate issued by Bihar might not be valid for claiming reservation benefits in Gujarat.

It's best to apply for an OBC-NCL certificate from Gujarat since your domicile is there. This will ensure you can claim reservation benefits if you're eligible according to Gujarat's OBC-NCL criteria.

If you are unsure about the specific requirements or have concerns, reach out to the IPU admissions department (contact details should be available on the official website). Explain your situation and inquire about the acceptable documents for claiming OBC-NCL benefits during counselling.

If obtaining a Gujarat OBC-NCL certificate in time for counselling seems challenging, explain your situation to the IPU authorities. They might be able to suggest alternative solutions or temporary measures while you work on getting the Gujarat certificate

I hope it helps!