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Upload Change Sets During Staggered Salesforce Service Upgrades
During Salesforce service upgrades, production and sandbox environments don't always run the same version of the platform because the upgrades are staggered. Some components may have new functionality that prevents you from deploying that type of component. You can deploy such components after the production org runs the same version as sandbox.
If you upload a change set with components that can't be deployed because of incompatible versions, the system detects which components can't be deployed. Salesforce gives you the option of uploading the remaining components.
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