Tecnhically it's not the same engine...
To start off, the engine has both variable valve timing on the intake and exhaust valves whereas before it was only on the exhaust. Also comparing the bore and stoke of the 1ZZ-FE models to the 2ZR-FE...
1ZZ-FE
79.0(bore) / 91.5(stroke) = 0.86338... (bore/strke ratio)
2ZR-FE
80.5 / 88.3 = 0.91166...
This shows that the 1ZZ-FE is more of an undersquare engine compared to the 2ZR-FE(square engine). It also has a longer stroke so the new Corollas are higher revving engine which is why max torue is only reached at 4,400prm with 175Nm compared to the 1ZZ-FE 4,200rpm, 170Nm. So maybe the difference might be minor but who knows, maybe they are built more like the 1NZ-FE(Yaris) which has conrods like pencils or it could even be the total opposite with a boost thirsty engine that is waiting to be slapped with 12psi.