You can definitely stick to the same stack for your server. Like Jakub says you'll have to make it suitable to communicate with an external API. When I built my first API (stack similar to yours, is it from Wes Bos Learn Node?) I struggled to get CORS right and to get Passport working.
React Native is relatively close to React, at least syntax wise. The difference and complexity for me was handling interactions and using the default React Native components, like FlatList/SectionList.
You can definitely stick to the same stack for your server. Like Jakub says you'll have to make it suitable to communicate with an external API. When I built my first API (stack similar to yours, is it from Wes Bos Learn Node?) I struggled to get CORS right and to get Passport working.
React Native is relatively close to React, at least syntax wise. The difference and complexity for me was handling interactions and using the default React Native components, like FlatList/SectionList.