From what I can tell, the R1 release does not have:
- a booklet providing episode summaries;
- hard plastic case packaging;
- Featurette – “Ships Of The Delta Quadrant”;
- Trailer – Star Trek: The Original Series on DVD;
- Trailer – Star Trek: The Next Generation on DVD;
- Trailer – Star Trek: Deep Space Nine on DVD;
- Subtitles in multiple foreign languages;
- German 5.1 Dolby Digital audio;
- Spanish, French and Italian 2.0 Dolby Surround audio;
Otherwise, these would appear to be identical.
I think R4 has come out slightly ahead in this race, although we miss out on the original English 2.0 Dolby Surround track that the R1 release has.