With your Miki loaded. go into the material room, check eye material settings, remember or write down these settings, load James, go into the material room, duplicate settings (excluding trans maps etc) that you wrote down or remembered.  Theorettically you should achieve similar results and I've gotten into the habit of setting up characters eyes in such a way to acheive better realism all derived from another character's initial setup. 

Not sure if the search function works on the forum after the big switchover sometime back but in the last 7 years coming here I've seen multiple topics with all the same questions you've posted here in the last few months...  might save yourself some time searching for an existing thread that will answer your question rather than posting and having to wait for an answer. 

The GR00VY GH0ULIE!

You are pure, you are snow
We are the useless sluts that they mould
Rock n roll is our epiphany
Culture, alienation, boredom and despair