I dont know about the two unbroken house furbabys in a crate...
I put bella (my un broken house trained and un crate broken puppy) and Bunny (my house broken and crate trained furbaby ) in a crate together.
I think Bunny told Bella if she had to step in her mess she was going to get it when they got out of it
BC Ever scent I put them together a few times in the crate. Bella has gotten the idea no to pee or poo in her crate.
Good luck on crate training! It will take a little time but they will get it.
Olivia, Bunny and Bella