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.
3 pin cpu fan to 4 pin motherboard.
Chassis and cpu fans may use either 3 pin or 4 pin power connectors.
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Do not use it for standard 4 pin rgb or 5 pin rgbw devices.
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My rig has 2 pairs of 3 pin fans phanteks ph140sp connected to two 4 pin motherboard headers asus z97m plus via basic y splitters and they work and control just fine.
You can plug a 3 pin fan into a 4 pin header just fine.
The fan connector will have two guides 1 and these will need to line up with the tab 2 that is on the motherboard fan header.
Case fan accessory color.
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Speed control options rpm range will vary between fans and motherboards on a 3 pin connection but the fan will spin.
Fans and on board fan headers are backwards compatible.
If you connect the 4 pin fan connector to a 3 pin header then the fan will run at maximum rpm.
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4 pin connectors are usually used by cpu fans with higher power consumption.