Impact of Migrating Field Service to Fusion

I want to understand the impact of migrating Oracle Field Service (OFS) to the new Oracle Fusion SKU, particularly regarding existing configurations, integrations, and data continuity. Specifically, we seek clarity on whether current workflows, business rules, security roles, and API-based extensions will be affected, along with any required reconfigurations. Additionally, we need to confirm how service request and work order data will be migrated, whether historical records and analytics will be retained, and if there will be any downtime during the transition. Understanding these factors will help us assess the effort required for migration and ensure a smooth transition.