～そんなテーマをもとに、コミュニティデザイナーの半沢直子さんがホスト役となって、各界で活躍する人たちと公開対談を行いました。

In this sentence they use と instead of に when they say 「ホスト役となって」

Does this change the translation from 'became a host'? And how does the
meaning change - does it imply that this is the context under which she was
working as for the following part of the sentence?
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2019-03-26T11:18:29.973
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2019-03-26T12:22:17.510
2019-03-26T12:22:17.510
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question
particle-と
Why is となって used here instead of になって