Honda has many different divisions and many different franchise types. You can buy a automobile, motorcycle, scooter or power equipment franchise.
This part number is a application that will fit both motorcycles and power equipment. The "PE" model is specific to the power equipment product line. It is identical to the non-power equipment product but noted differently in the part number.
Dealers order parts not via the part number but by a specific 'honda code'. The Honda Code is different for these two part numbers because they're sold through two different franchises. The part itself is the same.