I don't think the placement is the same, and from what I've seen the colors of the magnifica are better.
There's not a lot of info or pictures of H. malu's on line that I've been able to find, except for a small one. They stay smaller, and towards the bottom of the tank, and are usually kind of a drab color. Given the limited amount of info I could find, and assuming that it is correct, I would not pay the price of a magnifica to get a malu.
I think the magnificas like to perch on rocks at the top of the tank, are bigger, and more colorful. Usually their bases are a nice color and they get to show them off since they're on top of the rocks.
As far as the fish they host, I can never remember, so I will be totally useless on that point
You can try googleing H. magnifica (or ritteri - I'm pretty sure they go by this too) as well as H. malu and see what you come up with.
Also check the stickies at the top of the forum, I think you may find hosting info under the FAQ's for anemones. It's been a while since I looked, so I could be wrong - but if I remember right, there's some really good info there.
Good luck!