I expect as in all metal manufacture some (small) variations can be expected arising from a variety of factors throughout the supply chain e.g. quality or origin of raw materials, different suppliers & their methods, an ‘odd’ batch, quality control etc. are all subject to human elements and error even if working to the same sealed pattern.
What’s more genuine glengarry badges will have been subjected to over 140 years of atmospheric conditions in whatever environment(a) they found themselves in over that period. This can have drastically different effects on colour.
Also remember these have been prized for a long time so lovingly polished, lacquered and varnished by some collectors which over the years will have stained, discoloured, darkened, then perhaps been polished or partially cleaned again. A similar scenario may account for a copper or odd colourations described rather than the underlying metal being compositionally different.
All these many factors will undoubtedly lead to variations in patina.
Finally unless the collections studied were all completed prior to the 1900s then yes there is the possibility some studied were Fox restrikes.
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