I believe you can use either one to charge either phone because both are type c cables. Difference in charging cables could be when the phones were released. S20 FE was released October 2020 and A52 was released in February/March 2021.
Thanks Maria. The chargers look, essentially, identical. It's simply the cable. I found a link to tech support - as I didn't initially see the responses in here! ☺️ - and there wasn't an immediate response, but generally concurred with your assumption in the end: both C-type cables, so should be fine.