Is there any difference in the css and masterpage for online vs server edition?

Can i use a online site trial edition and make css changes, and then use that css on SharePoint server

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It is not adviced. I know that the css classes in Online in many cases has an o365-prefix for example. So there is at least little changes between the two.

Since updates are rolled out at a higher pace Online, there is also a risk of mismatch in actual DOM structure etc.

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