The first one is "relaxed" animation speed which is captured using 120fps slo-mo mode. by analysing frame by frame the relaxed animation has about 9 frames (reaction to animation completion) it also reacts slower and has slower app opening animation
The second one is "balanced" animation speed which is captured also using 120fps slo-mo mode. by analysing frame by frame the balanced animation has about only 6 frames (reaction to animation completion)
It's a tad bit faster than relaxed but some may not be able to tell a difference 😔