> my Pine64 [...] uses the exact same 64bit ARM CPU, as the Raspberry Pi 3.
> I wonder if it has any other identical components?

While the SoCs of the Raspberry Pi 3 and the Pine64 have the same CPU cores (Cortex-A53) at the same quantity (four) running at the same clock rate (1.2 GHz), the SoCs are not the same. It's the Broadcom BCM2837 in the Raspberry Pi 3 and the Allwinner A64 in the Pine64. That's why the GPUs are different. The BCM2837 contains the Broadcom VideoCore IV while the A64 contains the ARM Mali-400 MP2.