What I want to do, its a Layout versus Layout comparaison or a Mask versus Mask (MVM) - its the same thing -
when 2 layouts are loaded in the same panel.
Basically is an XOR between 2 layouts loaded in the same panel layer by layer
and to have the result in a 3rd layer set as I had loaded a 3rd layout in the same panel
like that I will can browse the differences w/ your cmd in menu bar > Tools > Browse Shapes
You have something of available doing that and if not its difficult to implement ?
PS. May be other people are interesting in doing the same thing but with an other operation: OR , NOT or AND