It will also have three square holes on the front and three wires entering the back.
Cpu fan 3 pin to 2 pin.
Fans may be either 5 volt dc or 12 volt dc fans.
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2 pack 4 pin molex actual 2 pin to 2 x 3 pin 4 pin pmw 12v pc case fan power adapter cable 3 pin or 4 pin pwm connector to molex computer cooler cooling fan splitter y power cable.
A 3 pin fan connector will be smaller in size than the 4 pin pwm fan connector.
4 pin connectors are usually used by cpu fans with higher power consumption.
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A four pin connector is a little different than the three pin connector since it has the extra fourth wire used for controlling and sending signals to the fan which likely has a chip on it that tells it to slow down or speed up in addition to the other wires the three pin connector has.
The image below displaying is the difference between a 4 pin pwm fan connector left and a 3 pin fan connector right installing a 3 pin fan to the motherboard.
Now 2 pin cooling fans have been less to use because the fan of 2 pin cannot meet the requirements in terms of shifting etc in contrast 3 pin 4 pin fan is the main stream now.
Chassis and cpu fans may use either 3 pin or 4 pin power connectors.
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The 3 connector fan is very common use in laptop it can adjust the fan speed according to the cpu.
Highly recommend if you need a 2 to 3 pin.
3 pin connectors are usually used for the smaller chassis fans with lower power consumption.
The 3 pin fan will fit onto the 2 pin you just need to match the holes and the pins and see which two contacts make the fan function.