Equality of two 8 bit buses in 7400 series logic?
Use 74HC688.

If you need something else, be sure to check https://en.m.wikipedia.org/wiki/List_of_7400_series_integrated_circuits.

Note that this 688 can still be sourced easily but most big 74xx building blocks are becoming less and less available. If you have a complex circuit to design, it may be time to learn CPLDs.