It's not a shot-by-shot remake. Some visuals from the original (Austrian Version) remain, but they don't pack the same punch. While the twist in the remake did differ slightly from the original, it wasn't enough for Goodnight Mommy (2022) to stand more solidly on its own. The terror that's revealed in the Austrian version of the film is extremely exaggerated, but it gives the audience an idea of how obsessive familial ties can be and how dangerous ideas can take hold to shocking conclusions. Goodnight Mommy (2022)'s finale does not deliver that same shock.
Yes, the horror may be reduced. You can even nitpick at the twist that may be far from the original. Yet, Goodnight Mommy's surprisingly suspenseful journey and understated twist on the genre outweigh its faults. It's not especially memorable, but it's not bad either.