The spells were completely different which was jarring, I agree.
Obliviate completely wipes memories and it's unknown if the wiped memories can ever be returned, in fact, it is an official job within the Ministry of Magic to be an Obliviator, showing that it is a difficult spell to get right and any poorly performed version of the spell can go badly wrong. The only attempt to reverse a powerful memory charm is seen in the books with Voldemort and Bertha Jorkins and he has to torture her to break it.
What Hermione did was implant a false memory which she used out of love for her parents. Ironically, the only other times we see this spell is when Tom Riddle uses it to frame his uncle for the murders of his father and paternal grandparents and where he frames a house-elf for the murder of an elderly witch he wishes to steal artefacts from.
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