Awww. I had to cut cords on every litter my rex queen had - she would just give them this disgusted look "I don't want to do that!" - so i tied and cut all the kittens - she did everything else.
Be sure you've counted the placentas - one for each kitten - if she retains them, she can get infection quickly.
As far as telling the 2 black boys apart, try to mark a little dot in their ears with a magic marker (red/green) - you'll have to keep doing this till they get bigger and you can tell the difference in face, body, etc.
BTW its BLUE and white - not grey and white
Pictures please soon