Both systems have a "footer" bar which is shared across all pages, and can be modified to remove version information and add your own (it's coding, but it's quite simple). You must retain the powered by atlassian link in there, but you can do anything you want with the rest.
As far as I can remember, the footer is the only place versions are routinely exposed to end-users.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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