One of the parents will have been agouti (agouti is where each strand of fur has different rings of colours for example black, blue and brown). The other parent could of been any colour.in.
Aguti isn't a breed, and color rarely ever helps in deciding what breed a rabbit is due to the huge amount of breeds that come in nearly all bunny-colors. Aguti is also very common, due to it being a dominant strain and also the color of wild rabbits.
But those two look like mixbreds.
Chances are if it doesn't have a pedigree and/or comes from a serious breeder, its mixed.
They are both girls! Just random they came from complety diffrent places and they look so alike! I thought Sully was a one off before Tilly turned up