Understanding The Words - All Different - For A Stamp Collector .

Many times on stamp chat rooms I bring up these words ---Is it all different ?
These are important words that we see especially for stamp auction firms and missing when a huge collection is written up in their catalogs . It is the two words stamp collectors don't make clear in their discussions here when talking about worldwide collections .
The question I like to enject into the same discussion is are they ALL-DIFFERENT . ?
What is not clear is it Trash Bags filled with stamps on paper in someone's garage or a humid dirty basement . We now are seeing 1,000,000 stamps on pallets of sheets of stamps still wrapped in the printers plastic wrap . at stamp auctions ,so a collectors can claim his collection has a million stamps but fails to announce he bought it at a stamp auction for $1,400.00 plus $2,000 dollars shipping it to his house .

So to be clear what is --ALL DIFFERENT ?
Does it include watermarks differences and does it include perforation difference . Then the area of color or shade difference ?
For us it is easy to agree on watermarks in the paper and also perforations differences . Shades of color becomes more of a problem because to be sure or to follow what is published , I would need over 200 different catalogs of each country ,plus special research booklets just to have a reference library.
Then we come to the attitude of collecting what you want and how you want in the hobby and which everybody agrees on .

So some day in the future ,hopefully will be able to change that claim of 330,000 all different to number like 400,000 in a few years because of pages like this .