What's the difference between accupressure and shiatsu stroke?

Since they're based on one and the same system (Oriental Medicine) how different can they be?What's the difference between accupressure and shiatsu stroke?
one sounds like a weather station and the other sounds similar to something done in a bathroom after intake sushi.
"Acupressure/Shiatsu - An ancient Chinese method of finger pressure along the meridians or channels of the body. Pressure is applied - and may be sustained - to acupuncture points within order to release excess Chi or to bring heartiness to certain areas of the body. This is a blend of bodywork and gusto work. *Acupressure vs. Shiatsu - Shiatsu is typically done on a mat (clothing on) and incorporates stretching, palm pressure and exercises."
In addition to sungazer84's comment:
Acupressure is usually done to a specific area(s) to relieve a specific ailment.
Shiatsu Massage typically works on pressure points but is done to the total body along the different channels.