Speech technologies - how to compare voice recordings?

Question

Audio

Greetings. There is a series of audio recordings for different periods of time. You need to somehow compare these records and determine whether they belong to the same person or not. Recording quality varies.
Tell me which way to dig (spectral analysis, special programs, algorithms, special hardware) or who to contact (communities, forums, special firms)?
I would be very grateful, thanks!
PS all the solutions I found on the internet come down to identification and verification. But my task is a little different.