Consulting, Tech - both open same doors
Finance, FMCG - IIMs are marginally better
Purely from peer group perspective IIMs have a large percentage of freshers which can be a positive or negative basis where you fall.
As someone rightly called out all of these places will open doors exclusively for you or faster but after that it’s mainly your performance and network that helps in career development. No special red carpet.
That said, with the pedigree people always assume you are smart unless you prove otherwise which is something other colleges don’t automatically get :) so you get an advantage there and people are willing to listen more to your opinion. This stays lifelong