What is the difference between HU64, 64-2, 64-3 and 64T on Condor key machine?

HU64, HU64-2, HU64-3 the distance from key tip to first biting is different (580,450,380) 1mm=100.

The difference sometimes depends on what country you live on.

This machine cuts different key ways.

Base on the key blank you working on

such as Mercedes HU64 because different country with different HU64 types, so Xhorse adds 3 types from all customers.
so for add spare key, when decode key customer can check the probe detection points whether at proper position.
one more thing, we usually try HU64-3 first

in UK, hu64-2 works

in Australia, hu64 or hu64-2 works

in España, HU64-2 is perfect

in China, mostly select HU64-2 for Mercedes

on a side note, M2 tighten HU64 key blank no problem.