They are same word, same concept.
Old Chinese pronounce it as Teni, directly means the Great Sky.
This is Chinese Tian Altar in forbidden city.
Emperor pray to Tian every year.
We do this ceremony from at least 3500 years ago.
Manchus, Mogolian,Han Chinese,and Xiongnu people all belived in Tian
The true leader of China called Son of Tian.
