Although both consequential and consequent can refer to something which happens as the result of something else, consequent is more common in this sense in modern English: the new measures were put into effect, and the consequent protest led to the dismissal of those responsible
Word Origin and History for consequential
adj.
1620s, from consequent (Latin consequentia) + -al (1). Meaning "pregnant with consequences, important" is recorded from 1728. Related: Consequentially (c.1600).