The "Spaniard" was mostly for reference, as right now I can't remember who sent me the information about the exams, so it might not apply to Europe or Spain.
But the documents required (at least previously to recent changes) for the license transfer were [0]:
1. Application form for Japanese Translation of foreign driver’s license
2. A driver’s license (original, in principle)
3. A photocopy of a residence card or a resident record etc [...] only required for licenses written in Arabic or Russian and licenses issued in certain countries[...]
And it didn't mention any residence documents. I don't know how that works today...
Yes, that's why I was replying that since we both are Spaniards "(Spaniard here too...)"