I think I have it figured out, let me know if I am missing something.
First off, you should have your pager be in your main slideshow. Then in addition to using the cycle-next cycle-prev
events, add this. It will run when the pager is activated, and move both slideshows to the correct slide.
var slideshows2 = $('.cycle-slideshow').on('cycle-pager-activated', function(e, opts) {
// advance the other slideshow
slideshows2.not(this).cycle('goto', opts.currSlide);
});
Here is an updated fiddle that shows it in action: Fiddle