Both versions are fullscreen. The timecodes relate to the German Version. The Danish one was cut as well! The differences originate from film tears that were left uncommented.

German Version: 77:04
Danish Version (They Came From Within): 83:31

00:07:08
A little bit of blood is missin in the Danish Version after Hobbes has cut open the girl with a scalpel.
2 sec.

00:08:19
Hobbes is cutting his own throat. (not bloody)
2 sec.

00:47:32
The guy who is being beat to death with the crowbar is shown a little longer in the German version.
1 sec.

00:48:36
Film tear.
2 sec.

01:04:28
There are about 4 seconds missing in the Danish version during the fight of Dr. Linsky with Tudor. (Possible film tear?)
4 sec.

01:04:40
Tudor rips a parasite off of the Doctor's face and tries to shove it into his mouth.
5 sec.

01:04:51
The German Version shows Dr. Linsky's bloody hands longer in Tudor's face.
3 Sec.

01:15:00
Film tear.
2 Sec.