Charly: point 6) "similar" content...
Be carefull Scott, there's a poster here who will bomb you with photo's of church steeple's and sky-scrapers if you say such things. If only I could remember who that was... hey! wait a minute!
SC: Nice try, Charly but no cigar I'm afraid. You are comparing apples and pears.
A neb-ankh (Osiris Brick) is but a miniature, ceremonial version of the larger stone container(s) found in the pyramids. You cannot say that a mastaba is but a miniature version of a step pyramid since a mastaba is a distinct structure in its own right. If you wanted a miniature or ceremonial version of a step pyramid it wouldn't look like a mastaba, it would look like a small step pyramid.
As you can see in the image above, a mastba is quite different in terms of its overall shape to a step pyramid's overall shape. Yes, you can argue that stacking ever decreasing sizes of mastabas on top of each other will produce the shape of a step pyramid - but the simple fact is, the two structures have different shapes and, imo, served quite different functions.
On the other hand, in terms of the stone box in G2 and an 'Osiris Brick (Neb-Ankh)', their shape is the same - a rectangular box. Unlike Mastaba v Step Pyramid, the two containers are identical in terms of their shape - the difference is their size. They also have other features that are consistent with each other - they are anonymous, they are undecorated, they are known to have contained earth and some even have lids and inner coffers:
As you can see in the image above, some Neb-Ankh even had lids and contained an inner box (coffer) which would hold a so-called 'Corn Mummy' (an effigy of Osiris made of mud with a hollow cavity filled with grain - just as the pyramids were the 'body of Osirs' and, imo, once filled with grain and other crops, tools, earthenware etc).
In short, Charly, a mastaba does not have the appearance of a step pyramid - it's a quite different shape and has other features that are different to a step pyramid. The basic shape of the 'Osiris Brick', on the other hand, appears very much like a mini stone (also wooden or fired) box (sometimes with lid) just like the larger type found in G2. Because of its different size I cannot say they're identical, only that they are similar - which they are. You cannot say that of the mastaba / step pyramid because they are very different.