Strictly speaking, it is not the same principle. From a performance point of view:
ANC is the noise-cancelling effect heard by the headphone user himself.anc headset， ENC is used for noise reduction heard on the other end of the phone during a call (not the experience of headset users).
In principle, some overlapping techniques are used between the two, such as adaptive filters. But ANC is more like a reverse superimposed noise. In addition to noise reduction, the ENC also features gain control, echo cancellation, and beamforming in the case of multiple microphones. The noise reduction part of ENC focuses on reducing conventional steady-state noise, or removing noise based on the correlation operation of multi-mic pickup effects.
In general, both are not easy to do well, and have high requirements on acoustic devices, acoustic design, and link delay.
like:
What does the anc function of the headset mean?
How to choose ANC and ENC noise cancelling headphones?
What is the difference between anc and enc headphones?
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