Dumb Question, yes?

Guys,
I just got to thinking (yes some of us do, do that at times!)

But, anyway, the OLD Gen 2 Hemi, 426. They were GREAT power producers, and had really high foot pounds, right? BUT, were plagued emission-wise. SO because of this, they were dropped from Production in 1971. BUT continued for racing. Makes sense?

WELL, the NEW Hemi's Say, the 5.7, they were brought to the new Emission tier what? 4? Anyway, they are SMALL block, right?

WELL the NEW 7.0 "426" is that like the old one and a big block, OR is that just a small "long" block? As well as the new "440". that too a long small block. Whats the difference from the old one to the 2 new larger "over" 400 CID.

See, to me, I'm not sure what they did here. I know we Mopar-fanatics have always wanted to see a true 440 Hemi. Sure enough even tho, it will never have the hype the 60's 426 did......

I'm just trying to wrap my head around the differences in the blocks with the different CID to them, and if the block is merely the same, just finish bored different to get a different Liter, or CID to each.....As I know those blocks are in fact heavy cast, in other words, thick walled.

I guess a dumb question, is the one, not asked, right?