There's typically not distinct symptoms that can tell pneumonia and bronchitis apart, because they typically overlap with cough, fever, sometimes difficulty breathing as well.
The ways to tell bronchitis and pneumonia apart are typically you would need to obtain an x-ray, a chest radiograph to determine if there are signs of consolidation or infiltrate on the chest radiograph. If that is found, typically that is more consistent with pneumonia. On a chest radiograph bronchitis does not really show any specific findings. So that is definitely one way to tell the difference between bronchitis and pneumonia. There are a few other things also; sometimes when the respiratory rate is more increased, that typically goes for pneumonia, also fever, although you can find it in both, usually happens more so with pneumonia as well, but again, it can be as bronchitis as well.
