These are all different projects awarded by ARPA-H as part of their THEA project [1]. They are all aimed at the same end goal but they have different approaches and specific focuses. Generally with ARPA and DARPA projects the best way to get a broad scope of what all is going on is via the proposers day videos [2]. And of course take a look at their teaming page to see what all 30-40 of the sub-projects/teams working on this overall project are doing [3].

1. https://arpa-h.gov/research-and-funding/programs/thea

2. https://www.youtube.com/watch?v=fRNpeU8_RLo

3. https://arpa-h.gov/research-and-funding/programs/thea/teamin...