Yes. keeping them together for tonight may help with the stress, but when they recover from the shock, keep a close eye on them. The stronger of the 2 may....make matters worse. I would separate them in the morning. As far as tonight's temps...birds that are injured, in shock, need a little extra heat than the outside temperature, especially night time temps. I would advise providing a lamp of some sort for them. Being able to see in the dark will also help calm them down.
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