Yes. Each fan header is supposed to be rated at 1A. Crappy fans can be rated at as much as 0.5A, but good fans can be as low as 0.2A. The amperage rating is almost always printed on the back of the fan. If wattage, such as 3w, divide by 12 to get the A.
So you can ostensibly run @2-4 fans per header on unpowered splitters.
Does not matter how many fans are set to what, each header has its own amperage rating.
DC (analog) is voltage controlled, is almost always 3pin, but can be 4pin or molex. Speeds are regulated by input voltage ranging from 12v max speed to 5v or 7v minimum, or about 40% or 60% ratings.
PWM is different. It runs constantly at 12v. The Pulse Modulation turns the fan on/off at variable rates, so unless at full speed, the fan is in a constant state of trying to spin all the way up.
Cpu_fan header is a dedicated PWM header, not changeable to analog.
Corsair directions state the aio pump connected to cpu_fan header (this automatically applies a constant 12v to the pump) and the fan to a sys_fan header.
I personally find that a pain as there's a big difference in case temps and cpu temps, so the cpu fan won't respond correctly to changing cpu temps. I hook the pump to any header (cpu-aux is good) and in bios permanently set the duty cycle at 100%, so there's no voltage variation. Fan goes on cpu_fan, so there's normal fan control with a Pwm fan.