Theatrical: Italy Eagle Pictures 4K Blu-ray
Redux: Lionsgate vs Eagle Pictures?
Final: Lionsgate or Eagle Pictures

Theatrical Cut: Italy Eagle Pictures 4K Blu-ray > US Lionsgate 4K Blu-ray
Redux Cut: Lionsgate vs Eagle Pictures?
Final Cut: Lionsgate or Eagle Pictures, both are not great (visible chroma noise)

Theatrical: Germany 4K Blu-ray/US Blu-ray DD 5.1 (1979 mix)

In the Lionsgate US/UK 6-disc set, there are 4 discs of the main feature. For whatever reason, the 4K discs lack the *original track. The Germany 4K Blu-ray release is different on this matter.

1. UBD: Final Cut: Atmos, DD2.0

2. UBD: Redux/Theatrical: Atmos

3. BD: Final Cut: Atmos, DD2.0

4. BD: Redux/Theatrical: Dtru5.1 (Redux mix?), DD5.1 (?), DD5.1 (Theatrical only), DD2.0 (downmix??)

   1. As a result the Theatrical Cut has 4 tracks, The Redux has 3. Differences are unclear.

5. BD: Hearts of Darkness

6. BD: Special Features

CriterionBlu-ray

CriterionBlu-ray

Criterion 2.0 Surround Track

Eureka release has a better encode, but is taken from an older master. The Criterion Blu-ray was a new restoration from the ground up, and is substantially improved despite not being as well encoded.