#ifndef _NTMMAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtAreMappedFilesTheSame routine determines whether two mapped files are the same.
 *
 * \param File1MappedAsAnImage A pointer to the base address of the first file mapped as an image.
 * \param File2MappedAsFile A pointer to the base address of the second file mapped as a file.
 * \return NTSTATUS Returns STATUS_SUCCESS if the files are the same; otherwise, an appropriate NTSTATUS error code.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtAreMappedFilesTheSame(
    _In_ PVOID File1MappedAsAnImage,
    _In_ PVOID File2MappedAsFile
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwAreMappedFilesTheSame(
    _In_ PVOID File1MappedAsAnImage,
    _In_ PVOID File2MappedAsFile
    );

#endif
View code on GitHub