Oliva miniacea or sericea?

[sakura-of-the-sea]

I've looked at photos of both species & am having difficulty finding differences between the two. I did notice that the patterning on <i>sericea</i> seems to be smaller than on <i>miniacea</i>, but is that enough to discern? I also am not sure about the orange apertures either. Some are shown with light to almost yellow mouths to deep orange. Then again, a lot of it could be camera flash-created shadow. Any tips to settle this issue?