Yes, correct! If you apply for a position in Scandinavia and get it, you won't be moved to a European base, but as stated, your line training might be conducted under a different AOC at a different base depending on where there is capacity. In this case, as you would have been given a Scandi base right from the start and signed a contract with a PSx company, you will not be given a release base in Spain, but instead move to the base given in your contract.
You'll do your OCC course on one AOC, and as mentioned, when you're released and ready to move to your assigned base, you'll simply do a sim check and a line check under the new AOC and you're good to go!