Difference between the Rheem RETST800SYS & Ruud UETST800SYS Thermostats

Difference between the Rheem RETST800SYS & Ruud UETST800SYS Thermostats

I was planning to replace my old thermostat with the Rheem RETST800SYS Econet Thermostat but I came across the Ruud UETST800SYS Econet Thermostat and both thermostats look similar. Kindly, what is the difference between the two thermostats?