Hi! This is simple. If you load your genesis 8 character, on the scene tab you select the character, and after that on the smart content tab you double click on genesis 8.1 tear. And then pop up a window. You need to select on the row the Genesis 3 Female and then loadding the tear on your character. That's it.
I have female tear on the parameter tab when I load the Genesis 8 character. I'm set it to 100% gone because no need for me after that 8.1 tear. But this is your choice. No need to set it gone. I'm think not looking good together in close renders.