I think it would be fine. Personally I don't like keeping danios in a 10g just because they are very active fish and IMO
deserve a longer tank....but it can work. And adding 2 more won't hurt anything.
Panda cories can get 2 inches, usually its the females since they are bigger. I have some 2 inch ones in my 29g. They won't get any larger than that and really danios or cories don't add a whole lot to the bioload.
Keep up on water changes and maybe add more plants in the future and you should be fine.