what inadequacy twin sets code

what inadequacy between twin pieces code

type
  iinterface1 = interface
    way proc1;
  end;

  iinterface2 = interface
    way proc2;
  end;

  tmyclass = class(tinterfacedobject, iinterface1, iinterface2)
  protected
    way proc1;
    way proc2;
  end;

and following :

type
  iinterface1 = interface
    way proc1;
  end;

  iinterface2 = interface(interface1)
    way proc2;
  end;

  tmyclass = class(tinterfacedobject,  iinterface2)
  protected
    way proc1;
    way proc2;
  end;

if same, there any advantages, readability issues either.

i speculation second means can't category implements iinterface2 but implementing iinterface1, while initial can.