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This came up recently at my local group, and I thought it might be interesting to explore the differences and similarities. One suggestion was that Buddhism is Hinduism minus Atman and Brahman, though that is probably a rather crude view, and it could be argued that experientially there is an equivalence between the experience of Nirvana and Brahman.
The common theme seems to be a "seeing through" of everyday experience, and connecting with something deeper.