They should be the same materials …ergo all-copper for both.
I clicked on your pic … 23 € for 3 m length pair? Everything is built to its pricepoint = Quality build cables would add a zero to the price.
my take:
- I dunno what they are actually made of at that suggested dodgy build and low price-point.
- You have already explained that one appears to be a mismatched ‘mystery metal” and not copper, that already suggests a poor and cheaply built must-to-avoid IMO. That “silver” finish is not silver at that price-point = likely the cheapest tin they could find.( …Cu Speaker cables with a legit Ag coating = do your own research on their sonic signature strengths and warts.
- hence they appear to be anything BUT copper at that lowly price-point , and no way IMO they are audiophile-grade OCC copper.
Suggest you move on .