Scale Question Fujumi

I have come accross a number of Fujumi models on ebay that are 1/16 scale like the f40, 512bb etc where they are advertised as Tamiya 1/12. Is this just to get the models flagged in your search engine or are the scales used by different manufactures subject to slight variations?

It's Ebay sellers using it to get it to show up on your search.

There are slight variations within a scale between manufacturers, but not such that Fujimi's 1/16 would equate to Tamiya's 1/12.