I just assumed it was a different variety. After all, Psidium guajava has an wide variation in fruit characteristics from plant to plant. No reason to think that friedrichsthalianum wouldn't also have some variation. The fact that Marco, who seems to really know his plants, says that it is just another variety leads me towards that conclusion. I like Jared's videos because of his globe trotting fruit searches and his super tasting ability, but that man doesn't know jack about plants.