[kwlug-disc] Standard for compute module?

[Mikalai Birukou]

Yesterday Stephen pointed out a hardware strategy of having modules with 
compute and ram that go into systems, like mentioned MNT Reform ( 
https://www.crowdsupply.com/mnt/reform ), Pyra ( 
https://www.dragonbox.de/en/pyra ), and as observed in the wild with 
cluster boards of pine ( https://www.pine64.org/clusterboard/ ), PI ( 
https://turingpi.com/ ).

I wonder, is there a standard of how connector pins are used, or, are 
these all potentially different? Open schematics, but different.