Jealousy is negative psychological reaction to people's progress and possession but lack of trust means you don't have confidence in a person or don't believe in whatever he or she says. Both are not the same thing.
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Jealousy is a negative feeling while lack of trust is a feeling of fear which can be negative or positive.Jealousy and lack of trust can't be the same thing, because jealousy is an act in the mind set that makes you feel bad towards something or someone, but for lack of trust, it is a different case in total, it's where by you don't believe in that thing or that person. But I prefer you not to trust some one or a thing, than to be jealous towards that person or that thing.