Heater A/C box differences(V6)

[WE287GN]

I have read here and there about it but still unsure..
I have had both side by side..TurboV6 vs NA V6 and with the heat sheild removed, I saw little diference between the shapes and size with the exception of the heat sheild mounts...
Am I way off here, or are they similar? I have plenty of extra sheilds. If I could find a way to mount one could I use and NA V6 box???

Basicly biulding an LC2 drivetrain Regal, and trying to save all the Turbo stuff for the GN resto..

Thanks