Preventive vs. Corrective Order
How can I differentiate a preventive orders vs. a corrective orders in SAP?
Is the order type the same for both PM01? or different?
It is there on the headerdata tab of maintenance order - PMActType.
You can do the configuration of this field in the path: SPRO> Logistics> Plant Maintenance and Customer Service> Maintenance and Service Processing> Maintenance and Service Orders> Functions and Settings for Order Types> Maintenance Activity Type
Here you can define maintenance activity types like Preventive, Corrective, Inspection etc. and assign to an order type.
Hope this helps!