Do you mean versions like June2018 vs September2018 or do you mean the different Qlik Sense editions like QS Desktop, QS Enterprise, QS Cloud, QS Cloud Business etc?
For the first question perhaps you should look up the What's New in .... pages in the online help site https://help.qlik.com/sense.
For the second have a look at the QS Product page on the main Qlik website Qlik Sense: Data Analytics for Every BI Need
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