Jiuzhaigou and Chengdu

In my opinion, I suggest you spend one full day in Chengdu to visit the Giant Panda Base and other attractions in the city. For the rest two days, you can visit Huanglong and Jiuzhaigou. They are very beautiful places worth two days' exploration.

I have already assigned a day at Huanglong and Songpan after two nights at Jiuzhaigou.
In this case, is your advice the same?

Do you mean you will stay a full day at Huanglong and Songpan and another three days at Jiuzhaigou? If yes, the time is enough to visit these two places. As for Chengdu, I think one day can cover the highlights of the city. But if you are interested, you can spend two days there.