PCIe Configuration space

Hi,

Is my understanding for MMIO of PCIe configuration space is that PCIe configuration space is mapped to the DRAM of the system(one to one) and each configuration space will take 4KB of space in the DRAM.

Is above statement is correct, also i took reference from this article : https://manybutfinite.com/post/motherboard-chipsets-memory-map/

Thanks.