I am installing confluence on different server, but using same license key. Will this affect the other environment?
You can use developer lisence.
See this for detaiols: https://confluence.atlassian.com/jirakb/how-to-get-a-jira-developer-license-744526918.html
This breaches your licence agreement. For the non production machines, use the developer licence that comes with the main one, the link is under the licence key in your my.atlassian.com account.
So there is a separate license cost for other environments needed?
No cost, the developer licence is bundled with commercial licences (Academics and free licences don't get them)
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