As I see it, a lot of people are much worried about the screen sizes, when they don't realize that the screen size increases, but the phones hardly do nowadays. My brother's 5.7inch Galaxy A8 is the same size as my old 5.5inch Note 2. My current Galaxy S7 Edge is smaller than my old Note 2 despite having the same 5.5inch screen. The 5.1inch Galaxy S7 is about the same size as the previous 4.7inch Galaxy S3.
Worry more about the actual phone size rather than the screen.
Anyway, as for iPhone SE size with decent specs like the Moto G 3rd, the Xperia Z3 compact comes to mind. It's the closest size I can think of.
Actually, I think it has even better specs:
Apple iPhone SE vs. Motorola Moto G (3rd gen) vs. Sony Xperia Z3 Compact - GSMArena.com