Can other rabbits (not mother) nurse baby bunnies?

I have 3 rabbits, 2 female, 1 male. The vets originally said all are female however I have found baby bunnies running across my lawn coming from under the decking. I have so far caught 4 and put in a hutch, they all have a full coat of fur and open eyes and are eating normal food as well as trying to ween the mother. HOWEVER, I think both of the females have given birth so there are two litters as they are two different breeds and can easily tell which belonged to which mother. The 4 I have caught don't look like they have all came from same mother so will the ones who aren't from the same mother still be able to ween from the other?