Breed and housing question

Hi all newbie here.
I've just bought 2 silkies chicks today aged 4 weeks, I've been told they are pullets but I've read its hard to tell until they are older.
I'm told they are silkie Sussex but I cant find that breed anywhere online.
I've got them in a two storey rabbit hutch for the time being until they are old enough to join my main coop.
I've also got 9 week old mini lion lop rabbits, would they be ok in the same run?
Also wondering if anyone has seen any birds like these before and can confirm the breed for me please, as I've read silkies need slightly more effort to raise than normal chucks.
I've put them to bed tonight and outside in a double hutch filled with straw to keep them warm, yet they are still huddled together next to the door.
I'm getting some quail tomorrow that are just about to come into pol.
Can I put my silkie chicks in with my quail to keep them warm of a night?
Its not exactly cold here atm where I am in the uk but they dont seem to be asleep at this time if night, they are constantly cheeping (is that a word) chirping and I'm just a bit worried about them.
Thank you in advance