Sovscope 70 and DEFA 70 releases were identical with the exception that they were photographed on 70 mm negative stock.
MGM Camera 65 (later renamed to Ultra Panavision 70) releases employed the same film format, but the use of 1.25X anamorphic optics yielded a super-wide aspect ratio of approximately 2.75:1.
[1] A special lens on a 70 mm projector added polarization and merged the two images on the screen.
[1] A similar Soviet system known as Stereo 70 did not employ anamorphics, resulting in an aspect ratio of 1.37:1.
Standard 70 mm theater prints were 70 mm wide, with the extra space used to accommodate the 6-channel magnetic soundtracks, consisting of five full-range channels (left, left-center, center, right-center and right) arrayed behind the screen, with the sixth channel providing surround effects.