Green button vs. grey button Atmos AI

What is the difference between the green and grey button Atmos AIs?

Maybe something like the Sherwood Wisdom, Wisdom II (blue button), and Widsom II (chrome button)

Or the Oceanic Pro Plus, Pro Plus 2, and Pro Plus 2.1?

From the website (grey=metal):
ATMOS AI VERSION 2 NOW SHIPPING
AERIS Begins Shipping the New ATMOS AI version 2 Dive Computer. Identified by its metal buttons, the new AI features the following additional new features:

Increased download memory from 256k to 512k - offers storage for approximately the same number of dives, however now includes cylinder pressure with every sample point.

Ready for Firmware Upgrade via ACI PC Interface (requires USB Cable)

Data Retention - maintains calculations indefinitely when the battery is changed