Win32 != WinNT. Win9x (Windows 95, 98, ME) implemented Win32, but did not use the NT kernel. Hell, Windows 3.11 (which was 16-bit, while all NT versions have been at least 32-bit) had a partial Win32 implementation called "Win32s" that could be used to run some Win32 programs even though the kernel was still 16-bit. Windows CE (including Windows Mobile, aside from the confusingly-named "Windows 10 Mobile") implements Win32, but is completely unlike the NT kernel. A modified version of the CE kernel was used on Windows Phone 7 (I know, because I wrote code that parsed WP7 kernel data structures, which scarcely resemble NT ones), but CE was scrapped in favor of NT for WP8 and later.
CE has been ported to more platforms than NT and has much lower minimum requirements, but uses a far simpler memory manager, does not support SMP (multiple hardware cores), does not support NTFS (it uses a weird variant of FAT that allows files to be "modules" loadable as executable images but not openable as files; NT has no such concept), does not support any kind of access control (a rudimentary access control system was grafted onto the CE kernel for WP7, but it bore no resemblance to the NT access control system that WP8-and-later use), does not support NT drivers, does not use the NT bootloader, is missing many security features (of which user accounts and access controls are only the most visible) that NT has, and is generally unsuited for anything except embedded systems (but has some features targeting those, such as some real-time support, that NT lacks).