What is the difference between a chronic condition and a chronic disease?

None if condition is the same as disease. Depends on local definition. Chronic condition could be being too rich or too poor for example.

Condition is more generic and may apply to symptoms as well while disease refers to a known specific disease, for example pain or malnutrition would be rather conditions with known or unknown related diagnoses while diabetes of pneumonia would be diseases.

If you have a chronic disease such as diabetes, heart disease, arthritis, lupus, HIV and many others, than you have had that condition for a long time. Your chronic disease if not resolved in a reasonable time, now becomes a chronic condition.