Dear aspirant,

A research psychologist is a mental health professional, who conducts experiments. In fact, research psychologists are often referred to as experimental psychologists . Specifically research psychologists spend the majority of their time conducting research studies with participants.

Where as

Applied psychology is the use of psychological principles, concepts, and theories to help clients, and/or patients manage or resolve emotional distress, psychological disorders, and/or mental illnesses. In other words, applied psychologists help other people cope with their life situations.

Hey there!
In BA Psychology honours you'll learn about the basics of psychology, theories, principles and methods, you'll research, conduct experiments, observational studies and scientific experiments related to mental health.

However, BA in applied psychology  you'll use these principles, concepts and theories to help people, manage distress, disorders, illness and maintaining wellness, you'll help others to deal with their everyday life situations.

Psychology honours is more theoretical and applied psychology as the name suggests, applies theory in real life situations.
Best of luck!