Unfortunately, only the Integromat platform supported that. When you migrate to Make, unique webhooks need to be created.
Please see this page: https://www.make.com/en/help/tools/webhooks#creating-custom-webhooks
One way to work around this is to have the scenario that has the main webhook run multiple scenarios via HTTP or Make modules.
Using HTTP modules, you can trigger other scenarios configured to start via Webhook.
Using Make modules, you can run modules directly, but can’t pass data into them unless you’re on the Pro, Teams, or Enterprise plan.