For a Delta quick changeover in ANC you probably will be okay, as the outbound plane is likely the same as the inbound. Check the gate # for arrival and departing ANC flights day-of in FlightAware or the Delta app -- this may give you some added reassurance. Delta flights arrive and leave from the same part of the terminal.
If you were flying AS I would be more wary as their service is much more frequent and would probably be a different aircraft.
Delta is very good at IRROPS as well, so you should be covered.