Overwrite prettyPhoto in functions.php?

Hi,

I’ve been trying to Google how to add support for another lightbox plugin in Visual Composers Grid Builder. And the closest to an answer I’ve come is that I need to overwrite prettyphoto by adding prettyPhoto() in your functions.php and call another lightbox.

Can anyone point my in the right direction of how to do this and call another lightbox preferable WP Featherlight.

I’ve been looking at the enqueueing documentations, but I’m afraid I’m still lost.

Has anyone done this? And wannna share their insights?
Thanks