The "non" L2 version might be able to flow a little more through the turbine, but as per Roys quote above there is SFA difference,
the issue with the T67 not fitting isnt the sheer size of them, but rather the much smaller turbine housing, a spacer plate could be made to suit, as the Comp cover is around GT3582 size, which does fit low mounted to a Rb25.
I would show you pics but some flamin mongrel stole my TD07 last year