By that reckoning I can claim that the origin of Brotli also dates back to 2012 or earlier. :-) Indeed, Brotli authors were also reponsible for the VP8 Lossless codec (2012), Pik (2017) and eventually JPEG XL (2019, in part). The entropy coding scheme is substantially similar among those codecs for this reason.

But really, the large amount of differences between two formats rather suggest that they were designed for different uses in mind, which I believe relate to the maximum possible I/O. Formats designed for the web don't have to have an extremely fast decoder because I/O is the bottleneck: 100 MB/s should be enough, and the earned time can be invested to higher compression ratio which affects the decoder performance.