They should be the same yes.
If they are different, then you can suspect a refurbished or reconditioned device from an unauthorized party.
On my iPhone 6 they are different.
Their warranty is also shown by apple online on both different imei numbers.And both different imei number have same serial number shown online...help me
What Apple website are you using?
Apple's online coverage checker does not use a imei number. It uses the Serial Number. Those are different numbers.
See here: https://checkcoverage.apple.com/
should IMEI number on phone back case and inside settings should match
