My daughter and I are really enjoying the 2024 Calendar (we normally do a couple of pages at a time), and I was wondering if you could use the Wren heroes in the 2021 or 2022 calendars? 

We try to make them forwards and backwards compatible. But there are often abilities that don't match or carry forward. For example, you wouldn't have use for abilities that let you redraw cards for the party members in earlier years. Or in 2023 is the only year you see Piloting, Computers, and Engeineering skills.