Yes this is model you sent on picture. Btw. Andre found cheap SUNON maglev fans - silent and cheaper than Noctua A4x20.. 12.8dB, €4,19/pcs here in Slovakia... https://www.gme.sk/ventilator-sunon-ha40201v4-999
You can try Sunon 🙂 or expensive noctua. With 20mm thin there could by louder whisper from small holes for fans in back cover. Some of them did another tunning for 20mm, 1 big hole in back cover for fan. But I can't compare :-) I have only my A4x10.
How much silent. Original fan is about 28dB a my noctua ~17dB, noctua A4x20 ~15dB and Sunon 12.8dB. 17dB is acceptable in living room for us. You can hear in at night as whisper, but during day all noises around are bigger than Hive (TV, childrens, ..)