This information is incomplete at best and incorrect at worst. Some themes are more forgiving about specific cards, for example "different growths" doesn't care about the rarity or ex, just species and set, and the 4 mystical island cover + emblem themes just need a certain total of a Long list of pokemon that feature that location. Some themes are more specific, like "big snorlax nuisance" specifically needs the full art snorlax. And there are way more hidden themes for sets of full art cards

Regarding the statement about all different versions of the same pokemon counting toward themed collections, I noticed that when I got a promo Venusaur from an event, that did not count. I had to obtain a regular Venusaur (same card without the promo icon) from boosters to complete the starter pokemon collection.

A lot of the information here is incorrect. Some of the rewards are different and some of the requirements. For example, "Different Journeys, Different Growth" rewards 22 instead of 33 emblem tickets, and "Collect 5 Charizard cards" and "Collect 5 Mewtwo cards" both require you to collect 5 of their base cards, not the EX variants. Please review the themed collections requirements and update this page if possible.