Of the 2 models you refer to, the one with the "snowflake" is the Titan LX Supreme. The difference in them is the environmental kit and a mouthpiece lip guard that has been added to the regular. Oh.. and the snowflake, which is just purely cosmetic but makes it easier for your dive shop employee to tell the difference. The intermediate pressure is set slightly different on the Supreme also. Otherwise it's the exact same regulator besides those parts.
If you have the regular Titan LX, you can make it a supreme with the enviro kit and mouthpiece.
The Legend LX Supreme is also the same difference, but it doesn't have an enviromental sealing kit since it's already sealed. It's only cosmetic differences and lower factory set Intermediate pressures on 2nd stage.
The mouthpiece lip guard is kinda nice though. I really liked it diving in colder water.