Are heart failure and congestive heart failure similar?

Yes. Heart failure is a colloquial term for the formal "congestive heart failure" diagnosis. The term "congestive" refers to the fact that with heart failure, fluid backs up in to the lungs, causing lung congestion and shortness of breath.
Weakness of heart. CHF is one subtype of heart failure. CHF is primarily caused by an issue in the heart that prevents it from being able to supply your body with the oxygen it needs. This can be caused by weakness of the heart muscle, insufficiency of a valve in the heart or a rhythm disturbance that disrupts the forward flow of blood from the heart. Medications and procedures are available for treatment.