Actually the same number of cells. 4 leaf modules are 16s 59v.
16s LiFePo4 are 51v.
Either way I have some really simple active energy transfer balancers. One wire to each cell. Not setup required.
Or you can do a full bms and program to what you want.
Bms is not needed in most cases for LiFePo4. They are drop in replacements. Only need to check the first few cycles that there are no outliers.