https://vimeo.com/ondemand/327236
https://linespeedjedi.com/understanding-the-differences-between-underhand-casting-goran-andersson-style-and-other-styles-of-casting
This is a beginners guide and helpful information to help you differentiate between the differences in Modern Scandi Style and Underhand casting similar to what Goran Andersson does. Differences include equipment like shooting head length, leader length, the grip, the lift the sweep, hand movements, body position.
So there is a difference between Underhand Casting and Modern Scandinavian Casting. There are also some similarities.