Uni, Grinner and Jansik Special are the same knot. Once through eye, twice through eye and number of turns are individual variations.
What I call the Clinch Knot is a sort of back-to-front Uni/Grinner/Jansik. What the Americans call a Clinch Knot is a multi-turn Half Blood, as is the Trilene Knot, except that in the last named the tag end is double-tucked.
Very few knots have a definitive form; different books illustate them in different ways.