User blog comment:Carebearheart/Food and Ores/@comment-28055547-20161207224950/@comment-27144707-20161213045012

You're correct - it has to do with how many times you've beat the game and started over on the same save file. The Route you choose only changes which set of resources you'll be getting your food/ore from, with Conquest giving you the resources on one side of the little list in the My Castle and Birthright giving you resources from the other side, while Revelation lets you get resources from both sides. I know that I've only ever had Jade/Emerald and Cabbage/I-don't-remember-what-but-I-think-Rice for any of my files and I've never started over on top of an existing file on my cartridge, so that's the info I'm going off of for now. You can try looking up the My Castle page on this Wikia and see if it says anything.