@Sideness Perhaps you need to find a swapping partner who finds 6GB/128GB enough and is willing to swap motherboards with you? You might still want to seek absolute certainty, but at first sight, I would think that the motherboard is the only difference (apart from the colour).
EDIT: Might make more sense (warranty-wise, IMEI) to keep motherboards and swap the exteriors.
Do I understand correctly, that the moss green one is not available at all with 256GB/ 8GB RAM? I want to order a Fairphone 5 and hoped it was just an availability issue…
It seems like it, but you could buy the back part separately(Which I somehow didn’t think of when ordering my phone and now I regret it, I don’t get how I didn’t think of that.), as mentioned in the first post in this topic.