Yes, both terms refer to the same class of chemicals that thin paint so it can be cleaned, or so that it can be applied more consistently.
Can you clean paint brushes with thinners?
This is actually the best way to make sure there's no paint left on your brushes after a paint project. Cleaning with thinners and rinsing after will help keep the bristles soft and flexible between painting projects.
How do professional painters clean their brushes?
Professional painters use paint thinners to clean their brushes, then typically rinse them in warm water to remove paint and chemicals before drying their brushes.