Two different responses events for reasoning summary?

API
1

Here in the responses streaming api https://platform.openai.com/docs/api-reference/responses-streaming
it has two events:

  1. response.reasoning_summary_text.delta
    “Emitted when a delta is added to a reasoning summary text.”

  2. response.reasoning_summary.delta
    “Emitted when there is a delta (partial update) to the reasoning summary content.”

What is the difference between them?
I think the only summary content is text anyway, so it seems like they are the same.

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