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The problem is that urban warfare is a rather different animal than urban law enforcement. I am very much afraid that the proliferation of automatic weaponry, hand grenades and more modern tactics has made it a bad time to be a horse in a place like Kherson or Bakhmut. This is not even mentioning open land. Horses might still be useful for transport, I admit, but the wise rider will keep his animal away from the front lines. This gives me an amazing mental image of a moon base where astronaut cavalry patrols its environs on spacesuited horses.

Spices would be risky; an unfamiliar spice is not likely to be recognized as valuable. You wouldn't know the agricultural situation in the other world, and spices may be like they are now, fairly common. On the other hand, if you come from a spice impoverished realm, you might not think of that, and they are very portable. The salt one is funny. Yes, it was valuable in ancient Rome, and you need some in your diet; if it is scarce, that is a factor. Animals look for and remember salt licks. You have to wonder why the ancients did not use large scale evaporative flats to extract salt from the sea; sea water is in relatively endless supply. If you could time travel, you could buy a couple of large cartons of Morton's (US salt brand) and go back and buy up much of Rome. I don't think that's a great item to count on being scarce in your alternate universe, but again, you might not know that if you were in the scarce salt side. Gems in general have issues. They have to be graded. if uncut, the value is lower. If cut, they have to be cared for; they tend toward brittle, and can chip. Diamond in particular and hard, but not tough. If you drop one, it can fracture. (Diamonds are much more plentiful than the market would seem, prices propped up by De Beers marketing. If you want a notion of their real value, try to sell one back to a jeweler.) Art and publications of any form, including card, are going to have to deal with 'What the hell is that?' (I like your idea for a Technology: the Menacing game.) A classic car could work within our world. Make your transport part of your wealth transfer. I don't see this working across universes. Technology can be a valuable commodity. That's likely what they want to take back.