I can't tell if they're from the same litter.
Could be Haakon, Bergen, Calzoni, Cosima, Commodore, or Evig http://www.nordligdrom.co.uk/kittens.html
You try to work out who's who
I'm going back for a reshoot and this time we make sure we know who is who by shooting an ID card first and then each kitten, one card and kitten at a time !