Since the early centuries CE, Hindu practices were also brought to Southeast Asia along with Buddhism.
Even today, in Thailand, Hindu gods are known within Buddhist practice.
The Buddha was born a Hindu, although he later rejected some central beliefs of Hinduism (such as existence of an atma or soul, and the hereditary primacy of the brahmin caste over other castes).
Rejection of an individual soul, and the denial of the ritual status of brahmins, are two of the main points in which Buddhism differs from Hinduism