They are not the same. Even though Nokia is infamous for not being able to produce a solid smartphone platform that would actually attract app developers, their feature phones (and Sony Ericsson's, too) were always known for having more finished, polished and faster UX when compared to competition like Siemens and Motorola.
The Nokia-branded feature phones produced during Microsoft's ownership and ones produced currently by HMD Global are based on somewhat horrible generic Chinese feature phone platforms and lack the finish and localisation. HMD likes to call one of them Series 30+. Nokia's Series 30 is easy to use and reliable feature phone platform, Series 30+ is not.