Hard to say how different they will ‘feel’ as there are other variables like BB height, headset type, spacers, stem angle/length etc. Why does your current frame feel small?
Assuming all else is equal then:
Frame 2: Imagine your bars about 3cm higher and a tiny smidgin closer to you.
Frame 3: Imagine your bars about 5cm higher and about 1cm further away.
I expect you’d find these differences very noticeable.
edit: Just saw your follow up post. Essentially more reach gives you a ‘longer’ fit, and more stack gives you a ‘taller’ fit. They are independent of each other, taking the bottom bracket as the reference point.