Practical High Current Transistor Connections
Current sharing on redundant DCDC converters requires accurate voltage matching and accurate current detection with share splitting communication between the supplies.  Diode Or SHARING often requires a preload of 5% to 10% to achieve stability with no loads from my experience as resonance can occur from each driver sharing the same current sense see each other’s current pump as a disturbance.
Another way to achieve redundancy is by multi-phase drivers that operate in parallel , not by splitting the load but by enabling parallel drivers on load demand.
Such an example is https://www.powersystemsdesign.com/articles/multiphase-dcdc-converters/39/4250