Visit civicrm/admin/dedupesettings?reset=1 for Dedupe configuration.
This page provide your general setting to override Dedupe Rule for specific Component.
You can configure dedupe rules for each contribution page and profile. Form specific configuration will get higher priority.
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Profile ID specific Setting: if you want profile ID specific Dedupe rule, Visit Profile Setting form then expand 'Advanced Settings' panel, You will see Dedupe Rule dropdown list. you can choose the rule as per fields available in the profile.
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Contribution Page ID Specific Setting: if you want Contribution page ID specific Dedupe rule, Visit 'Manage Contribution Pages' -> Configure -> Include Profile. You will see the Dedupe Rule dropdown list. you can choose the rule as per fields available in the included profile.
