NtAreMappedFilesTheSame - NtDoc

#ifndef _NTMMAPI_H
// Sections
#if (PHNT_MODE != PHNT_MODE_KERNEL)

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