Getting a "double" bonus at Empire?

[KnickNut3]

Hey. Recently switched from PP to Empire, signed up using a rake return program that includes 20% match of first deposit. It looks like it registered correctly on my bonus summary page.

Now, when I have the option to deposit, it has the option of entering a deposit bonus code. Should I try entering a different one, like one of the reload codes or first deposit codes? Will it help me double my bonus? Will it just not work? The only thing I don't want it to do is nullify my rake return, but I don't want to give up 40 free bucks if possible. I remember when I was originally on PP I got 25 flat or so to sign up, then I added the percentage on top of it with WOW20 or something. Any idea how it would work here?

Thanks for the feedback.