Yes, the SRT6 TB is 74mm and the NA TB is 68mm.
Surprisingly, the intake manifold inlet on the NA is 74mm, so nothing needed there.
Ensure that all the input piping to the 74mm TB is at least 74mm, and re-use the old 68mm MAF,
To get most performance, you will need a tune, Eurocharge or whatever.
Before starting, make sure you have a new O ring.

See :
https://www.crossfireforum.org/forum...ade-guide.html