Insider (from a long article, acquiring the balls wasn't easy, so the conclusions are based on limited data):
[MLB commissioner] promised from the podium, that was all over: "Every baseball that's in use in '22 was produced under the new manufacturing process" – meaning, the deader ball – "and in fact, the process has resulted in a more consistent baseball."
But according to a new analysis of more than 200 balls used in games during the 2022 season conducted by ... a Society for American Baseball Research award-winning astrophysicist, that's not true. Major League Baseball did not settle into using a single, more consistent ball last season, [the] research suggests: It used three.
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This new third ball's weight centers somewhere between the juiced ball the league phased out last season and the newly announced dead ball: It is on average about one-and-a-half grams lighter than the juiced and one gram heavier than the dead. According to the league's own research, a heavier ball tends to have more pop off the bat, meaning the third ball would likely travel farther than a dead ball hit with equal force.
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The only Goldilocks balls we obtained from the regular season that did not have commemorative stamps were found in Yankees games
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an MLB spokesman said in a statement that "the conclusions of this research are wholly inaccurate and just plain wrong."