It would be really nice to have an interface for comparing two shape codes, especially in insane difficulty. For example, you can copy a shape code that your factory is producing, then open up a goal shape and paste into a comparison box, and you can see side by side what’s different.
The shape viewer screen could show more than one shape side-by-side. There’s plenty of room in that screen. So, like the OP wrote, we just need a way to provide a second shape code.

also a way to rotate the shape as CuRuSuWu and RuSuWuCu are not different to the Vortex but are everywhere else
“also a way to rotate the shape as CuRuSuWu and RuSuWuCu are not different to the Vortex but are everywhere else” …Yep ! (shall be in an other sugestion ?! …I ‘ll do it).