Two Salesforce organisations can use the same object name in different ways. Custom fields, record types, validation rules, flows and managed packages change what a valid record means. The working map must come from the client org.
Relationships may depend on Salesforce IDs, external IDs or approved matching rules. Contacts must attach to the correct accounts, opportunities to the right customer and custom records to their intended parents. Ambiguous lookups are held rather than attached by name alone.
Bulk updates can trigger flows, assignment, notifications or other automation. The client identifies fields and operations that may activate downstream behaviour, and test batches are reviewed before production volumes.
Technology and SaaS
Manufacturing
Financial Services
Property
Education