In terms of hardware it is practically the same. However Crazyflie has its own development while these cheap controllers can work with any standard open source

In terms of hardware it is practically the same. However Crazyflie has its own development while these cheap controllers can work with any standard open source flight software such as Cleanflight, Betaflight, etc. They are also cheaper than Crazyflie, you can have a drone for half the money.