Does New Relic preserve custom attributes during export‑import cycles?

Goal: Confirm that custom attributes attached to New Relic events survive a full export‑import cycle without loss or alteration. The process relies on the Data Export API to pull a known time window of JSON payloads and the Events API to re‑ingest that payload into a test account. Because the export may drop null‑valued fields or reorder keys, and because re‑ingestion can create duplicate points that affect billing, it is unclear whether the restored data retains the exact original attribute set.

Specific questions:

• Are null‑valued custom attributes preserved after re‑ingestion?
• Does any reordering of JSON keys affect the ability to match attributes?
• Is there a detectable difference in attribute values between the original export and the restored dataset?