Автор: http://www.swissdelphicenter.ch

uses
   TypInfo;

 function CloneProperty(SourceComp, TargetComp: TObject;
   Properties: array of string): Boolean;
 var
   i: Integer;
 begin
   Result := True;
   try
     for i := Low(Properties) to High(Properties) do
     begin
       if not IsPublishedProp(SourceComp, Properties[I]) then Continue;
       if not IsPublishedProp(TargetComp, Properties[I]) then Continue;
       if PropType(SourceComp, Properties[I]) <> PropType(TargetComp, Properties[I]) then
         Continue;
       case PropType(SourceComp, Properties[i]) of
         tkClass:
           SetObjectProp(TargetComp, Properties[i],
             GetObjectProp(SourceComp, Properties[i]));
         tkMethod:
           SetMethodProp(TargetComp, Properties[I], GetMethodProp(SourceComp,
             Properties[I]));
         else
           SetPropValue(TargetComp, Properties[i], GetPropValue(SourceComp, Properties[i]));
       end;
     end;
   except
     Result := False;
   end;
 end;

 procedure TForm1.Button1Click(Sender: TObject);
 begin
   if CloneProperty(Button1, Button2, ['Left', 'Font', 'PopupMenu', 'OnClick']) then
     ShowMessage('OK');
 end;