Match Incremented Class With Incremented Ids From Different Loops [jQuery / Wordpress]

After hours of research and try and errors I start my first question here. If it can be done with wordpress syntax even better. Otherwise I think I'm near to the solution. I want a

Solution 1:

If i'm understanding correctly this might help

$('.gallery li').on('click', function(e) {
   e.preventDefault();
   var className = $(this).find('a').attr('class');
   var imgContent = $('#'+className).html();
});