I have searched the Arm Cortex-X4 Core Technical Reference Manual, Arm® Architecture Reference Manual for A-profile architecture and a couple of other resources, but I could not find information about the transistors. The only information i got was from https://en.wikipedia.org/wiki/List_of_Qualcomm_Snapdragon_systems_on_chips#Snapdragon_8_Gen_2_(2023) (the parts about gen 2 and gen 3) and https://www.qualcomm.com/products/mobile/snapdragon/smartphones/snapdragon-8-series-mobile-platforms/snapdragon-8-gen-3-mobile-platform. - 4nm (TSMC N4) process (from snapdragon 8 Gen 2) - Process node:4 nm (from qualcom).
Arm provides soft-IP designs to silicon manufacturers. How a design translates into a concrete transistor count or silicon area depends on the physical implementation choices made by a partner. The same design can have very different speed/area depending on silicon process and cell library choice used.
HTH, Pete