<?xml version="1.0" encoding="UTF-8"?>
<FlexiPage xmlns="http://soap.sforce.com/2006/04/metadata">
    <flexiPageRegions>
        ... snip ...
    </flexiPageRegions>
    <masterLabel>Practitioner</masterLabel>
    <pageTemplate>flexipage:recordHomeTemplateDesktop</pageTemplate>
    <sobjectType>HealthCloudGA__EhrPractitioner__c</sobjectType>
    <type>RecordPage</type>
</FlexiPage>

<masterLabel>Practitioner</masterLabel>
    <pageTemplate>flexipage:recordHomeTemplateDesktop</pageTemplate>
    <sobjectType>Account</sobjectType>
    <type>RecordPage</type>
</FlexiPage>

Error: You can't change a Lightning Page's associated template