No difference at all.
78XX came first, Xerox rebranded the 78XXi when they re-launched with the next generation firmware.
But that firmware is a free update to the 7855.
So All the Connectkey products that are an "i" series , all it means is they came out of the warehouse with a firmware that starts with 073.
The non- "i" series came with 071 or 072 firmware versions.
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