It’s a bit buried in our documentation however customers subscribing to Microsoft 365 E3 are entitled to 3 Premium templates of their choice for Purview Compliance Manager at no charge.
These templates can be interchanged as needed as long as no greater than 3 templates are used at any given time. If more than that 3 templates are required, additional template entitlements can be “purchased” or subscribed to to increase the quantity available.
For example, I installed the CJIS, IRS 1075, & HIPAA Hitech compliance templates which ran its audit scan regularly. I swapped out the HIPAA Hitech scan for GDPR a month later without an additional charge or penalty.
For more details, read the following documentation:
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Kurt Shintaku's Blog 