difference between T190 and T191 ???

Can please someone explain the difference between the T190 and T191. As proofen in a previous post the T191 exists also as a 1900 Mhz version. I had both in my hands the 190 from the US and the 191 from the UK, both look the same, but different firmware.
TNX

ok i got 3 models of the T190, T191. They look all the same.
T190 ?? version 1800 MHZ software: 5.xx
unlocksolution: New T190 unlock.zip and t19x.zip
T191 Southamerican Version 1900 MHZ software: 9.xx
unlocksolution: t19x.zip
T191 EURO version 1800 MHZ software: 1.xx
unlocksolution: kima software

attached pics of the southamerican version (74 KB)

for european solution use kima only up to version 1.78 (including this one). for version 1.81, 1.87, 1.88 use cloning eeprom solution

for t191 9.xx i don't know - i'm from europe