This is a local concern in the area you work in. If the AHJ approves a set of plans and has the required legal authority to make sure the building was constructed to plan, then the AHJ can look for that requirement in addition to code.
If the AHJ does not have the legal authority to enforce the plans then he can only enforce the code as adopted in that area.
The AHJ here does not check building vs plans because the legal authority is not there. The plan checks here are for permitting purposes and to see if code minimums are met inthe design. Change happen all the time and the record set turned in after the job is the owners to do with what they want.
It depends on what rules and/or laws you are working under.
