Does anyone know if the scandium alloy framed .357 mag j-frames have the same titanium frame pins that the new UC j-frame models by Lipsey are advertising as feature upgrades?

I picked up an M&P 340 for a great price and am wondering what features this model doesn't have that the new UC model does have.  The M&P 340 has a sizeable U notch rear sight cut into the top of the frame which i believe is feature equivalent to the dovetailed U notch sight coming on the UC models.  It has a white XS sight as opposed to the green sight on the UC models.  A plus for the 340 is that it will chamber .357 if I catch a wild hair to embrace the pain.  

I'm not seeing any other real meaningful feature differences between the two models.

Am I missing something?  Thanks.

The M&P 340 is scandium, has stronger pins, and a stainless blast shield above the cylinder gap to prevent flame cutting.  

It’s the stoutest scandium j frame made.

The UC model's do have titanium pin's.
The Revolver Guy has an interesting 3 part write up on the development, manufacture of the UC model's