Well, you are going back many years to make that comparison. I'm sure a lot of cores look similar to each other from different companies thru out the years. 900global I'm sure will not copy cores, they are too good for that. And if they do, that would be tragic.
Reflector core description from the 900G website: "The Reflectorâ„¢ Core utilizes two asymmetric halves merged into one to create a symmetric core. This will create an incredibly strong, yet stable reaction throughout the lane."
Dimension information sheet: "The Core: At the heart of the Dimension is the all-new, technologically advanced Continuumâ„¢ core. By inverting and rotating two identical asymmetric halves 90 degrees, and then merging them together, we have created equal mass displacement.
This translates into a tune-able break point found in asymmetry with the continuation and finish of symmetry. This high performance ball possesses tremendous versatility and performance to fit a variety of styles and conditions."