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Beats Fit Pro already have 30 hours of battery life with the charging case and the earbuds themselves get 7 hours with ANC off. Also they support Adaptive EQ.

So the only actual differences are:
1. 4 ear tips vs 3
2. 12% smaller charging case
3. Slightly more rounded design to the earbuds

https://www.beatsbydre.com/earbuds/beats-fit-pro

https://www.rtings.com/headphones/reviews/beats/fit-pro-true-wireless

Your own link to the Beats Fit Pro clearly states it is 24 hours of total battery life, and 6 hours of bud time as I mentioned. The Powerbeats Fit is rumored to be 30 hours total battery life, and 7 hours of bud time.

"Up to 6 hours of listening time (with ANC turned on) plus an additional 18 hours provided by its pocket-sized charging case." (There are also other big headlines like "24 hours battery life!" attached to various athletic models showing off the Beats Fit Pro.)
 
I'm pretty sure the confusion stems between ANC on vs ANC off quoted battery life.

You are correct that the Beats Fit Pro earbuds get 6 hours of battery life and 24 hours combined with the case, if you're using ANC the whole time.

Beats Fit Pro earbuds get 7 hours of battery life and 30 hours combined with the case with ANC off.
 
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