Rivers of Life/Earth's Great Rivers

There are three titles involved:

Rivers of Life (2019)

Earth's Great Rivers (2019)

Earth's Great Rivers II (2022)

I am just wondering if these three titles should be merged into one. Some background from what I can glean in having watched all twelve episodes.

Rivers of Life and Earth's Great Rivers are ostensibly the same series, each originally designed as a three-part miniseries. One was a US title produced for PBS, the other a UK title produced for the BBC. The production company decided to produce 3 additional episodes for each, the three in the UK listed under Earth's Great Rivers II, the three additional episodes in the US which are listed under Rivers of Life.

Each of the six episodes are exactly the same (Nile, Amazon, and Mississippi the original three; Zambezi, Yukon, and Danube the additional three) except for the series title and the person who acts as the off screen narrator (there is a US narrator, and a UK narrator). The video is the same, the script for the narrator is the same, and I believe the copyright holder is the same (listed as both the BBC and PBS).