They all are copies of an Amp crimper as far as I know.
Yes they are all copies of the AMP tool. They do a decent job but the FTZ is a slightly higher quality than the one made in Taiwan & sold by many.
I searched high and low for a better crimp tool for heat shrink and currently use a slightly modified
Anderson 1352G1 for yellow heat shrink and slightly modified
Hollingsworth H-7B tool for Blue & Red.
Both of these tools "contain" or swage the terminal like the AMP tools and don't just make it oval and allow it to "splooge out" (splooge really is a technical term
The die tolerances are far better & crimp bands wider than most of the Chinese/Taiwan ratcheting tools. These tools were hand picked after lots of personal testing of "heat shrink specific" tools.
I was simply unhappy with the mediocre level of crimp tools avaible for heat shrink terminals so went and found some tools that work better and give more repeatable testing results..
Anderson = Yellow FTZ Heat Shrink
Hollingsworth = Blue & Red FTZ Heat Shrink
Still that FTZ, for 98% of people, will do just fine...