What is the use of excess lib library files compiled by the kernel source code?

Scenario Description: Download the kernel source code 2.6.32 from the kernel official website, and then use the make menuconfig command to configure the kernel. The 2.6.32 folder will be generated under/lib/module during the make module process.

Some drivers are stored in this directory as modules, but unfortunately the kernel version on the machine is 2.6.32.431. What I'm curious about is what the kernel version is,

So there is a 2.6.32.431 folder in the actual directory/lib/module. Obviously, if this is generated, If I execute the make install command, what will happen,

Weeping ghosts and gods. It's hard to tell, but I don't really understand the combination of vmlinuz and initrd. As the kernel source code versions are inconsistent, it is obvious that the generated kernel cannot be correctly started,

Error message: Can not find file/lib/module/2.6.32/module. Dep.

What is the use of excess lib library files compiled by the kernel source code?