Photo Gallery Image Order - Direction Once Enlarged

Is it possible to define image order for lightbox?
Basically the same request as this one: Photo Gallery image direction once enlarged
I prefer to show the initial images in collage layout and not as thumbs layout - as the collage initial size looks better for me - yet I would like to the images in lightbox to follow the horizontal order. (currently working only for the thumbs layout I suppose…)

Thank you,