"Tibetisches Totenbuch"? "Tibetanisches Totenbuch" - different books?
It looks like Tibetisches Totenbuch is a German name for what's popularly known as "The Tibetan Book of the Dead".

In that case, (quotes from Wikipedia)


  According to Tibetan tradition, the "Liberation Through Hearing During the Intermediate State" was composed in the 8th century by Padmasambhava, written down by his primary student, Yeshe Tsogyal, buried in the Gampo hills in central Tibet and subsequently discovered by a Tibetan terton, Karma Lingpa, in the 14th century.
  
  It is part of a larger terma cycle, Profound Dharma of Self-Liberation through the Intention of the Peaceful and Wrathful Ones, (zab-chos zhi khro dgongs pa rang grol, also known as kar-gling zhi-khro, popularly known as "Karma Lingpa's Peaceful and Wrathful Ones."
  
  The Profound Dharma of Self-Liberation is known in several versions, containing varying numbers of sections and subsections, and arranged in different orders, ranging from around ten to thirty-eight titles. The individual texts cover a wide range of subjects, including meditation instructions, visualizations of deities, liturgies and prayers, lists of mantras, descriptions of the signs of death, indications of future rebirth, and texts such as the bar do thos grol that are concerned with the bardo-state.


From what I can see on the Internet, it looks like  Tibetisches and  Tibet-an-isches are used interchangeably and both simply mean "Tibetan". If this is correct, then they most likely refer to different versions or different translations of the same basic text.