function getWindowWidth2() {
  return window.innerWidth || document.body.clientWidth;
}

$(window).resize(function(){
  myMatchHeight('.sameHeight1'); // first group of things I want the same height
  myMatchHeight('.sameHeight2'); // second group of things I want the same height
});
$(window).load(function(){
  myMatchHeight('.sameHeight1');
  myMatchHeight('.sameHeight2');
});

function myMatchHeight(x){
  var w = getWindowWidth2(); // more accurate than $(window).width();
    //console.log('current width: ' + w);
    if (w >= 768){ // no need to resize if stacking on mobile
        var h = 0;
        $(x).each(function(){ // loop through each element with this class
            $(this).css({'height':'auto'}); // reset so it's not based on your adjusted height
            if($(this).outerHeight() > h){  // check to see if we have a new height champion
                h = $(this).outerHeight();
            }
        });
        $(x).css({'height':h}); // set all the guys with this class to the height of the tallest
    }
}