I found some old sources, and I could add those puzzles. The Studio warns explicitly about puzzles published elsewhere. But does that also apply to ones made by me, years ago in a Finnish magazine?
As long as we can reasonably assume you are the author and the other publication doesn't have a problem with it either, it is fine with me. Perhaps you could provide the original source as a comment to the judges when you submit the puzzle, for future reference.
Sorry, I was swamped by crosswords that needed test solving.
I didn't find the magazines (at least yet) but I took an easier way out: I had to change numbers to letters anyway, so I transposed the whole puzzle. Basically only the idea remains and that was mine.
The puzzles (this and several future ones if they are OK to add) were published in "Iisakin kryptot ja pulmat" (many issues) by Kolmiokirja. Some of you may know it as a sponsor of Finnish teams in WPC. Usually was represented by Erja Gullsten or Heidi Niskala.