I have something that looks identical to the second gold one
It works fine with 3mm filament, I use a geared stepper motor.
I dont think it will work with 1.75, the idler bearing is grooved and the 1.75 would disappear into it, leaving very little to grip on.
The long arm on the idler tension thread is a pain, it always seems to be sticking out and catching on things (will depend on where you mount it of course)