Is eXRD the same as xrd?

I'm curious, could you clarify the difference between eXRD and xrd? Are they interchangeable terms or do they represent distinct entities within the cryptocurrency space? I've heard of both, but I'm not entirely sure how they relate to each other. Is there a specific use case or purpose that each serves, or do they serve similar functions? As someone who's interested in staying informed about the latest developments in the cryptocurrency market, I'd appreciate any clarification you can provide.