Yep. 3DAGE is right. You will need these and a plug-in called Genesis Generation X to load Gen 4 morphs and convert them into shapes for these figures. Simply put, you drag M4 or V4 into Gen X, then drag the morph(s) for the character you want to convert (if the morphs rely on, say, Morphs++, you may need to load these separately as some injections do not load them themselves). You can drag non-character morphs too, such as Creature Creator morphs and Morphs++.
As I have a very good collection of Genesis body morphs (such as Genesis Evolution, V5, M5, Muscularity, etc.) I don’t find the Gen X body conversions as useful as I did, as I find I can better build my own body shapes using these Genesis native morphs, but it is very handy for faces as these are a lot harder to do, and many of the custom Gen 4 head morphs can do things that can’t be done by dialling in on Genesis directly yourself. If you don’t have many of these Genesis add-ons though, or if the morph you are transferring is out of the ordinary, you may still find the body morph transfers worthwhile.
When it comes to simply textures, though, you can load these on to Genesis without needing to have any add ons. You simply go into surfaces and change the UV settings en masse to V4 or M4 (or even The Kids).