They're not the same level things. Neomacs has an Emacs-y browser inside it, for example. It is also possible to embed arbitrary content in buffer (multiple modes, real tables, canvas, etc) while Emacs is restricted to plain text plus some display property hack to support image. It's possible to have a much more powerful org-mode in Neomacs, although we definitely need a user base and contributors to make that happen... Currently, the API and the model is there, so is the possibility.
https://github.com/abo-abo/lispy