It's been my experience that colors also differ between RGB device type (flex strip, nodes, square nodes, etc.)
That said, when integrating multiple RGB device types in your display, the RGB "standard" will get you approximate color matches between devices.
The only way to make it the "same" would be to measure the wavelengths of the red, green and blue of each device and re-write the SSC software accordingly. Since that would take expensive equipment and time, approximate color matches is good enough for me!