i use his rss, and i've used that on several different new figures.  it's not hard to add materials to it.  no,  the fake sss is completely different and separate.

but rss isn't the point.  if you look at his nodes for just the freckles, it should be possible and not too much work to roll you own.  and it should be really, really easy to create groupings of freckles and adjust those groupings in the material room, just as it's pretty easy to do that with groupings/density of various elements.  cloud nodes, u and v nodes, and even a simple tile node could do that.  on the old mapping, a tile node with a blur could blend out from the torso to the limbs.  the new maps might be a bit more difficult to adjust, but probably could be handled with one or more of the above.  or, you could just make a simple greyscale density map and still use nodes to do the random freckles within those zones. 

then you wouldn't have to draw freckles on each and every map.   you could just apply different freckle settings.  if you ask bagginsbill, he might even be willing to make a freckle matmatic/parmatic script so that you could dial the number of freckles, opacity, etc. in the pose room.

in terms of your new character (i'm assuming freebie since you've posted to the poser forum), well it shouldn't get any easier than applying a material, whatever you choose.   i think of those as separate issues- one is freckles you can apply to any texture and another is a single texture/material with freckles.  you should do whatever works best for you for the latter.  i was suggesting  solutions for the former because  the  other solutions mentioned were painting freckles on a map or waiting for someone to make freckle maps with an alpha channel.  one sounds much more tedious and difficult, and the other sounds unlikely to occur.

by the way, snow sultan has free v4 seam guides posted to the freepository at daz and i think here in freestuff.