Agarita berries look similar to Red Currants which is why the Agarita is sometimes called Wild Currant or even just Currant (which is technically incorrect).
However, the shrubs are different. True currants are Ribes x. while agarita is Mahonia trifoliolata. Currants come in different shades (red, white, pink, black while agarita is only red).
Agarita wood is very yellow which is one reason that it is desired for pen blanks, but since it is a very small shrub, it is difficult to get enough good wood from its branches. Hence the desirability of roots.
I really don't know what Currant wood looks like though.