I really can't compare the two, since I'm using the Silver Dragon with a desktop rig and the Lavricable with my DAPs. I will say that they're probably pretty close.
Yes and no
Yes, I use the Lazuli Ref cable with my Utopia via my desktop system. But...
No, the line in my sig about Utopia/copper cable refers to my portable rig, where I use a LQI cables OCC copper cable. Laz Ref is way too bulky to use with a DAP, even if I had one which is appropriately terminated.
Doesn't sound like you've tried any silver cable with Empy. Setting aside your dislike of Moon cables, I find I prefer Empy with both my silver cables (Silver Dragon & Lavricable) vs copper I've tried (Laz Ref, ZMF Atmos C, ArcticCables OCC, ZMF stock copper cable).
That said, I think you and I have different tastes/preferences in sound sig. You posted earlier that you 'detest' Utopia and called Empy '...the best headphones...' To my ears, 'perfect' is somewhere in-between the two, perhaps a bit closer to Utopia. So Laz Ref 'softens' Utopia a bit, while silver cables perk Empy up a bit.
=+=+=+=
As always, remember that cables are passive devices, which can't add information, only selectively filter.