How do I pass a selected value in dropdown to another dropdown

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Javascript

jQuery

what i want to do, after i input my data in a form with a dropdown

and then if i click a checkbox, it pass my value from my previous form to another form

What I have tried:

this is what i have tried

$('input[name=sameKTP]').change(function() {
       if($('input[name="sameKTP"]').is(':checked')) {
           $(this).prop('checked',true);
           $('#domcAddressDataSubmit').val($('#ktpAddressDataSubmit').val());
           $('#domcStateId').val($('#ktpStateId').val());
           $('#domcCityId').val($('#ktpCityId').val());
           $('#domcDistrictId').val($('#ktpDistrictId').val());
           $('#domcSubDistrictId').val($('#ktpSubDistrictId ').val());
           $('#domcRtDataSubmit').val($('#ktpRtDataSubmit').val());
           $('#domcRwDataSubmit').val($('#ktpRwDataSubmit').val());
       } else {
           $(this).prop('checked',false);
           $('#domcAddressDataSubmit').val('');
           $('#domcStateId').val('');
           $('#domcCityId').val('');
           $('#domcDistrictId').val('');
           $('#domcSubDistrictId').val('');
           $('#domcRtDataSubmit').val('');
           $('#domcRwDataSubmit').val('');
       }
   });

code above only return the value in type=text input tag, not the select tag