Phrozen Mega 8kS is faster than Elegoo Saturn 2?

Good evening. I am an Elegoo Saturn 2 owner and I would like to upgrade to Phrozen Mega 8k S to take advantage of the 15-inch platter. I tried to design using the new version of Chitubox (2.0) where you can load the profile of the Mega 8kS. To my great amazement, I learned that the print time forecast, instead of decreasing (as I thought), actually doubled. According to the software, the Phrozen Mega 8kS takes about double the time to print the exact same project compared to my Saturn 2. I therefore wanted to know if it is an evaluation setting error of the Chitubox software or if the Mega 8ks is really more " slow" of the Saturn 2.Thanx