You should watch the TBAC videos comparing the cans. Until the Magnus came out, the Nomad-LT was the quietest can they tested.I don't see a rating for the Nomad-LTi on pew science. The only one I see is for the standard Nomad L. In the first part of the review for the Nomad-L, this is also stated.
"Note that the Nomad-L is also offered in a titanium version (the Nomad-LT). While similar, the sound signatures of the Nomad-L and Nomad-LT are not identical; the Nomad-L exhibits slightly higher sound signature suppression performance on this platform, in accordance with PEW Science testing and analysis."
The sound signatures might be slightly different, but it will be by a negligible amount, being that they are designed 100% identical, other than the build material.