Sure, ask would be the moral thing to do.
However, whenever I post a pic of of a puzzle I designed, I automatically assume it might be copied. Actually a compliment.
I would only be concerned if the copier sold the puzzle online or at craft shows. Now that indeed would be theft of intellectual property for personal gain. If that happened I would be quite entertained by making life miserable for the culprit. The first call would be to my cousin Vinnie. He has experience in breaking kneecaps.
bb