The best and the perfect code you'll require to sync two owl carousels so that it slides together. Check the code below

  $(document).ready(function () {
    // Initialize the first carousel
    var owl1 = $('#owl-carousel1').owlCarousel();

    // Initialize the second carousel
    var owl2 = $('#owl-carousel2').owlCarousel();

    // Flag to prevent recursive calls
    var changingFromOwl1 = false;
    var changingFromOwl2 = false;

    // Event listener for owl-carousel1 changes
    owl1.on('change.owl.carousel', function (event) {
      if (!changingFromOwl2 && event.namespace && event.property.name === 'position') {
        changingFromOwl1 = true;
        var target = event.relatedTarget.relative(event.property.value, true);
        owl2.owlCarousel('to', target, 300, true);
        changingFromOwl1 = false;
      }
    });

    // Event listener for owl-carousel2 changes
    owl2.on('change.owl.carousel', function (event) {
      if (!changingFromOwl1 && event.namespace && event.property.name === 'position') {
        changingFromOwl2 = true;
        var target = event.relatedTarget.relative(event.property.value, true);
        owl1.owlCarousel('to', target, 300, true);
        changingFromOwl2 = false;
      }
    });
  });