@Peter Cranston Developed here you can say is the mature deployments who have adapted the Azure model in their business and developing is the new start-up that's why CSP has Gold and Silver tiers according to the business stage of the cusomer.
You can find some more information here:
https://learn.microsoft.com/en-us/partner-center/learn-about-competencies
Hope it helps!!!
Please 'Accept as answer' if it helped, so that it can help others in the community looking for help on similar topics