To clear a few things up, the original Excalibur saws were made by a company named Summerville Designs in Canada. The same company designed and manufactured the type 1 DeWalt 788. The Excalibur saws had a top lifting arm. An optional foot pedal to lift the top arm was available. The saw came in a 20 and 30 inch,
General made woodworking tools in Canada. They made table saws, band saws, planners and jointer and other woodworking tools. They also had a division called General International. You can guess what that means. They imported tools from China and Taiwan. Somewhere down the line, General international bought the Excalibur line and moved the manufacturing to Taiwan along with the DeWalt 788. They improved the design of the Excalibur saws, which became the EX line and the DeWalt saw became the type 2.
It has been a common practice in tool manufacturing to build tools on the same line for different distributors. It's up to the distributor to provide their own quality control. So even if the tools look alike, they may not be the same quality or have the same features.
I don't know anything about King Tools, but just because it looks like an EX, it doesn't mean it's the same quality.
Woodcraft sells a line of tools with the Woodriver name. They are all made in China and Taiwan. If you look at the Woodriver 16" scroll saw, it looks just like several other brands.
So, the name hasn't changed, a different distributor is now selling them in the U.S.