Is an nsec just a synced passkey?

Raw JSON

{
  "kind": 1,
  "id": "000000fb29f6b49c1563d0e54e6e780339d107d62701192938493c12c571f92f",
  "pubkey": "460c25e682fda7832b52d1f22d3d22b3176d972f60dcdc3212ed8c92ef85065c",
  "created_at": 1787016456,
  "tags": [
    [
      "client",
      "Amethyst"
    ],
    [
      "nonce",
      "100D}S",
      "24"
    ]
  ],
  "content": "Is an nsec just a synced passkey?",
  "sig": "a88011fac712603da7de10b904a701fe5a411d2dcc10923e400d8c750a3613a919f31159684974f094e67d5748df8b4e09a313ead7789de0bfafcf5fe94a9b45"
}