Can you tell the breeds from the video?

Question
http://www.youtube.com/watch?v=2R4_QwThaKw

The male lop is about 1 1/2 and the females are almost a year old.  The lop has a CR2 tattooed in the left ear.

The black one has bigger ears and is a month older. The tan one has thinner ears that are often folded lengthwise. Her belly is white and the undercoat is grey.  Hope you can ID them from the poor quality video.  

Is there some kind of key to ID rabbits or do you just have to do it from memory?

Answer
hi tom its very hard tosay but the one with the droopy ears is a dwarf lop and the black one looks to have  bit of satin in it but without knowing where yougot them its not very easy to give them a breed.
i live in england and all our breeds each have a proper standard with description of type, weight,colour so that when we judge we can doit against the breeds standard.
dave.