OK. For those of you who are seriously try to help ... thank you.
I guess what I am really asking is: In what way do these two differ? Yes, I know you can go in reverse with one of them and yes, one makes them bigger than the other, but, in what way do the two differ when trying to get conforming clothing to fit V4’s breasts?
Example: Say you’re trying to get an article of lingerie to fit V4’s boobs more snugly without any poke-through or large air gaps between her and the lingerie.
If I use the “large” morph to make the cups bigger, that helps fix poke-through on the sides of the breasts but now the front of the cup protrudes WAY out, leaving an air-gap. The same seems to happen when adjusting the “size” morph.
I see a subtle difference in the breast shape in the image LycanthropeX uploaded above, but mainly in size of the breasts. The shape (thickness, width, height) basically all look the same. Just the distance between the left and right breast appears different. So, these morphs do not seem to help when using them in an article of clothing to get it to fit V4’s bust more snugly without poke-through.
Oh, BTW, I have tried magnets MANY times with very minimal results. Perhaps I am not using them correctly. If anyone can suggest a good place to get a tutorial on using magnets, I would be MOST appreciative.