Hi Urmo, if by changes you mean Jira issue, then you can do the following:
1. Open the relevant issue in JIRA.
2. Open the History tab in the Activity section.
However, if you meant everything, including issues, configuration and etc ... then there isn't a direct way. You can use a third-party app like https://marketplace.atlassian.com/apps/1211611/configuration-manager-for-jira-cmj?tab=overview to compare your snapshots within different period of time.
I hope it helps!
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