Did Japan put the same women in both Worlds and 4CC before? I thought they normally tried to spread the joy.
Yes.
2018 4CC: Satoko Miyahara, Kaori Sakamoto, Mai Mihara
2018 Olys: Satoko Miyahara, Kaori Sakamoto
2018 Worlds: Satoko Miyahara, Wakaba Higuchi
2019 4CC: Rika Kihira, Kaori Sakamoto, Mai Mihara
2019 Worlds: Rika Kihira, Kaori Sakamoto, Satoko Miyahara
2020 4CC: Rika Kihira, Wakaba Higuchi, Kaori Sakamoto
2020 Worlds: Rika Kihira, Wakaba Higuchi, Satoko Miyahara
If anything the "spread the wealth" is new, Japan couldn't send the same team in 2022 for 4CC and Olympics because of the quarantine requirement so as a consequence the 4CC and Worlds team is different (as Worlds team follow Olys).
And then the National champions who usually are assigned to both 4CC and Worlds start declining the 4CC assignment (Shoma Uno, Kaori Sakamoto, Yuma Kagiyama starting this year) opening up a spot for the 4th or 5th place to move up.