The graphic they added to the Mystery Booster packs had a square background, and the one they used for The List seems to have a rounded background, which creates a telltale difference in the shape of the cards border as you can see on Chatter of the Squirrel and Ancient Den as well as subtle changes in its placement on new border cards, as seen on Boros Challenger
I am doing my own research on the topic and plan to report back with a blog post or video in the near future
The difference is integration
The Booster Box is the gold standard for Pokmon TCG sealed productsa sealed carton packed with booster packs from a specific set
While other Unown cards feel like puzzle pieces in a strange cosmic joke, Unown V is more like
This is how those target spell cards work they go on the stack after/above the cards they target, so as you work your way down the stack they will apply their effects before that targeted spell does and if their effect is to remove that target from the stack prematurely, then it will never get to resolve at all