I think Lyman uses the same FL sizer in both their 38S&W & 38Super die sets. Most likely the 38Super FL sizer.
Their sets are marked for use in loading either caliber.

I really don't see any problem with that. The 38Super is a straight, non- tapered case. The 38S&W tapers something like a .001".
Standard variations in brass and chamber dimensions will often show more than that.

But I realize a lot of people want the correct one.

My Lee 38S&W dies have worked just fine for yrs.
But they're not color case hardened, didn't come in an ol'west style cardboard box.
But it did have a shell holder.

It's nice to have options. It's your dollars.