There is no difference, it is the same thing.

Jerusalem and Jerusalem artichoke are actually different names for the same plant. Jerusalem artichoke is the scientific name of this plant, while Jerusalem artichoke is its common name among the people. This plant is native to North America and was later introduced to China via Europe. Because its appearance is somewhat similar to ginger, but it does not have the spiciness of ginger, it is also called Jerusalem artichoke or ginger that is not spicy in China. In addition, Jerusalem artichoke is also known as ghost ginger. 1-3 meters high, with massive underground stems and fibrous roots. The stem is erect, branched, and covered with short white hairs or bristles. The leaves are usually opposite and have petioles, but the upper leaves are alternate.