It's much more common in guitar pickup design. One more clue might be the apparent difference in color in the 2 bars, as if the surface was polished only on one side (e.g. north pole). So, better quality ceramic design?I have never heard of, and have never seen an AlNiCo bar magnet (in pickup design), not to say that they don’t exist...but I highly doubt an inexpensive pickup made over-seas would have one...
But traditional pickup design yields AlNiCo pole pieces and/or Ceramic Bar magnets.
[I have no idea how Neodymium pickups are designed, with Neo pole pieces or a Neo bar magnet...or something else...]
Neodymium normally is silver and shiny/polished.