Now available – Scaling across tiers in Azure Database for MySQL and PostgreSQL
Scaling among hardware generations within services tiers is now supported in all available regions, as is scaling between general purpose and memory optimized service tiers for Azure Database for MySQL and PostgreSQL. Scaling among hardware generations allows you to take advantage of the newer hardware generation for servers previously created in the older hardware generation.
Learn more about Azure Database for PostgreSQL pricing tiers.
Learn more about Azure Database for MySQL pricing tiers.
Source: Azure Roadmap