Design-wise, almost all of the lawnmower blades are interchangeable between single-blade and multi-blade lawnmowers. The dimensions of the blades are the only thing that will vary. Multi-blade mowers require that the blades overlap slightly to achieve consistent and clean cuts. This means that the two-blade mower blades may be slightly shorter than the single-blade blades. If the lawnmower mounts and blade match, the different types of lawnmower blades can be interchanged. The best one for you depends on your personal preferences and lawn conditions. Depending on what type of mower you use, certain blades might perform poorly. A mulching blade, for example, can be attached to a regular mower. However, it must be equipped with additional accessories to ensure that it does a good job of mulching.