boot.emmc.win and boot.img are both image files used in the context of Android devices, but they serve slightly different purposes or are used in different contexts:

sudo apt install android-tools-fsutils
git clone https://github.com/osm0sis/mkbootimg

Remember: Test before you flash. A single bad boot image can soft-brick your device. Always keep a verified stock boot image or a full TWRP backup as a lifeline.

boot.emmc.win, on the other hand, seems to be a specific format or naming convention used for certain operations, possibly related to eMMC storage. It might contain a similar or identical payload to boot.img but is prepared or formatted for eMMC-based devices.