Thanks for this helpfull picture!
Now the question is: Can the user somehow distinguish these versions from the outside (different Model naming, different serial-number, different $something_else)?
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D7800 BETA 256MB RAM (2x Nanya NT5CC64M16FP-DI)
U-Boot 2012.07-21984-gd7d026f [local,local] (Apr 15 2015 - 10:49:55) U-boot 2012.07 dni1 V0.9 for DNI HW ID: 29764958 -
D7800 regular production 512MB (2x Nanya NT5CC128M16IP-DI)
U-Boot 2012.07 [local,local] (Jul 01 2015 - 13:18:15) U-boot 2012.07 dni1 V1.1 for DNI HW ID: 29764958