Some injections work from V3 to David with no tweaking. The big problem is channels being available and named properly. If you have V3 with all the injections you want saved as a .cr2 file, you can transfer them to David with MorphMangager. I've gotten some interesting effects with the V3 Male faces on him. Taking the male V3 morphs and applying them works too, so long as you counter with a base V3 morph (exporting all the body parts of V3, and applying each one as a morph to David) or use the breast gone morph to counter on the chest. There are endless possibilities for variation with these figures if you're willing to put in the time and effort. I've got almost all the V3/M3 variations and the mix and match is really neat.