not sure but I think my cactus is the same as the one by TBGDN

I see you have already posted in the ID forum.
Without a bloom, you can't confirm that it's this particular cultivar, it may just be the straight species.
Ladyfinger Cactus (Mammillaria elongata)

The color of the spines is not a match. The "copper" of "Copper King" refers to its reddish spines.