As long as you have the hard drive space leave both..
There are many times you may still want to access 2018 settings or whatever other reason..
Just realize that files created/migrated to newer versions cannot be directly openeded/edited by older versions anymore.. You can reference them thought with the appropriate updates to the older program version.. (example you need 2018.3 to open 2019 files)
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Inventor 2023 - Dell Precision 5570
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