That’s not true, the tables you used has calculated the assent into the dive. How is 60 feet NDL for air I don’t understand thisAre you sure? If I dive 32% and air to NDL at 100' and then start my ascent I'm betting that if I use the same ascent time and the same safety stop I will have less nitrogen at the surface with the nitrox. What do you think? If you disagree what about dives to 60 feet to NDL's using 50% and air?
P.s. if you mean staying at 60 to NDL there’s no difference if you stay to the nitrogen loading limit of the gas you use. About 72 minutes for air and 4 hours for 50% O2 have to check that.