Przekładaniec

Przekładaniec ("Roly Poly" or "Layer Cake" or "Hodge Podge" in English) is a 1968 Polish made-for-tv short film based on a work by Stanislaw Lem. It is directed by Andrzej Wajda.

It's at youtube in 4 parts. Part 1:

part 2, part 3, part 4

Film Journal describes it this way:

this is set in the 21st century. Racing car driver Richard Fox is ‘reconstructed’ by transplants after an accident and his lawyer helps him solve the mystery of whether he is himself or his brother, killed in the crash.

English subtitles would help a lot; but they are not provided in these videos, and I can't find a transcript or text subtitles online. The film was still interesting to watch.