Other people have already mentioned it.
Logitech designs the product, writes the Firmware, basically designed the Sensor on their own, uses ARM MCU´s from ST, using molded rubber instead of glueing rubber on costs more, so on and so forth.
The Sentey Revolution on the other Hand is a completely done OEM Product, Sentey only orders the Mouse with their Logo on it, and thats it. That design in particular has also been sold by other brands, like for example by Cyber Snipa as the Silencer, or by Ace of Sweden as the EDGE 3200, or by Revoltec as the Fightmouse Elite, so on and so forth.