The similarities are:
1)Both taught us truth.
2)To avoid cravings.
3)To avoid huge desires.
4)To follow Ahimsa.
5)To respect other's life including animals.
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Both relegions denied the authority of vedasĀ 
both religions opposed animal sacrifice
both relegions followed similar attitude towards trade and commerce.
both relegions never sought to abolish caste system infact both seemed to have accepted the social relations
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