Not a good comparison at all. Amed has the requisite skills to being a good defensive 1B. Mainly, he can field grounders well. But since the bar is kind of low and more of a lower leverage position (which IMO is vastly overstated by most), it's hard to be a good first baseman on defense alone. But Amed could be a very fine overall 1B against righties with his 120 wRC+ and speed.
J Naylor can't ever be a CF because he's slow and not great at fielding fly balls. JRam never was a catcher so it makes no sense to convert him into one now when it takes years of learning, and besides his arm is kind of weak.