Agreed on it being difficult to tell apart. Was hoping the animations would be enough of a silhouette change to notice, but it's really not doing it in the heat of combat.
We can try to toy with the armor attachments more, but if we make it any bigger, it then needs to have a bigger hitbox (which isn't a bad thing, just more work, and likely a tuning pass to follow.)
One of the lower hanging solutions we can put into place would be to add more always-on particle effects to light them up in a way that stands out as unusual.