No. The EFI uses a completely different partition table, GPT.
On computers that support booting directly from GPT disks in EFI mode, there may or may not be an MBR at all. Some modern disk utilities, however, will refuse to re-partition the drive if the MBR does not exist. (You would have to erase the entire partition table, and start over)
Otherwise, the disk usually contains a stub MBR whose purpose is to store a custom bootloader for the rest of the GPT disk, in exactly the same way Dynamic Disk Overlays (Kroll) were used in the 90s for large hard drives to overcome various capacity limits.
That’s what I suspected. This won’t work on newer versions of Windows, installed with Safe Boot enabled.