probably not necessary to add "technology" or the like, but as you've provided no context, it is difficult to say. According to the first link, both terms refer to the same technique/process.

http://www.hexcel.com/Products/Matrix Products/Thermoplastic...

http://www.peninsulaplastics.com/thermoforming.asp


Und hier eine Anleitung zum selbermachen:
http://www.ch-forrer.ch/Modellflug/Tipps/Tiefziehen.htm