In the working range Lithium does not have a big voltage swing
Here are some numbers for you :
NMC cell nominal 3.7, fully charged 4.2.
LA cell nominal voltage 2 volts, fully charged ~2.12.
For "48" volt configurations :
14 cell NMC is 51.8 nominal, 58.8 volts fully charged (7 volt change)
24 cell (four 12v in series) LA 48v nominal, is 50.8 fully charged (2.8 volt change)
For 60v configuration :
16 cell NMC 59.2 volts nominal, fully charged 67.2 volts (8 volt change)
30 cell LA 60 volts nominal, fully charged 63.5 volts (3.5 volt change)
As a reminder, nominal voltage is the voltage of a battery cell at 50% of the charge.
Now sure, for longevity cells shouldn't be charged to full 4.2 volts. Let's for fun of it "charge" them to 4.1 volts :
65.6 volts charged, 59.2 at 50%, 48 volts near 10-15%.
So yeah, if you're cycling your cells within 10-20% range of their capacity, there won't be too much of a voltage swing. If you're cycling them from 95% down to 20% like recommended, they will have a significantly higher voltage swing than Lead Acid.