[question] Since nuttx and uboot have the same .config configuration and macros, do they also overlap in functionality?

I use `nuttx` to build for a certain development board, and use [`uboot`](https://github.com/u-boot/u-boot) (which is a BootLoader tool) to build for the same development board. Both will generate a `.config` configuration file with the same name, which also contains macros with similar names about CPU, SPI, and Device. Since `nuttx` and `uboot` have the same `.config` configuration and macros, do they also overlap in functionality? Could you explain it in detail? Thanks.
for nuttx:
```shell
~/nuttxspace/nuttx$ tools/configure.sh -l stm32f769i-disco:nsh
```
for uboot:
```shell
~/u-boot$ make stm32f769-disco_defconfig
```