abberati

const nodes = [...document.getElementsByClassName('yourself-item__title')]

const maxHeight = nodes.reduce((max, { clientHeight }) => max > clientHeight ? max : clientHeight, 0)

nodes.forEach(node => node.style.height = maxHeight + 'px')

function doMagic(path) {
$.getJSON(path, function (data) {
    $(data).each(function(index, item) {
    $('#table').append(
        '<tr><td class="col1">'+ item.title01 +'</td><td class="col2">' + item.shopcode + '</td><td> <a href="' + item.link + '">' + item.title + '</a></td><td class="col3">' + item.cost + '</td></tr>'
        );
    });
});
}

doMagic('/js/db04.json')
doMagic('/js/db05.json')

// или
['/js/db04.json', '/js/db05.json', '/js/db06.json'].forEach(doMagic)