The other side reveals:

SKhynix H9HKNNNFBMAU-DRNEH 8 GB LPDDR4X SDRAM with the SoC Kirin 990 layered underneath

Kioxia (Toshiba) M-CT041930U544311JPN 256 GB UFS

HiSilicon Hi1103 Wi-Fi module (as seen in the Mate 20 X 5G)

An empty pad, which apparently hosts an additional front-end module in the 5G version of this phone

HiSilicon Hi6363 RF transceiver (as in the Mate 20 Pro)

HiSilicon Hi6526 power management IC

NXP 80T37 (likely NFC controller)