The SD Card Copier works. If have used it loads of times to copy from larger to smaller SD cards, smaller to larger SD cards, SD cards to SSD, SSD to SD cards, etc. If you are having problems, then something is wrong with your SD card or the card reader.
I had one card reader that seemed to function perfectly when used for reading and writing files, but frequently resulted in errors when used with the SD card copier or Etcher. Ended up tossing that one and using another. No troubles now.
Note that when copying a larger card to a smaller card, the used space on the larger card cannot exceed the capacity of the smaller card (should be obvious, but...).
And yes, there are loads of fake SD cards, especially SanDisk and Samsung brands. Ebay is rife with this nonsense, but even reputable retailers can get bitten, so it's best to test your cards to be sure.
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?