The actual SoCs used on each type of core module are somewhat well hidden (no mention on the main website as far as I can see) but can be found through a bit of

The actual SoCs used on each type of core module are somewhat well hidden (no mention on the main website as far as I can see) but can be found through a bit of research: RPI-CM4 Lite: Broadcom BCM2711 A-06: Rockchip RK3399 A-04: Allwinner H6 R-01: Allwinner D1