Sorry I missed out on getting this one faster, but the simple answer is:
No, the panels are not interchangeable between the 4-5 different "panel frame" knock-offs and with the different style connectors that the latest rendition is using, there is no way to swap panels between the older models and the newer models. We've been trying on this one for quite some time, but it's just a flawed design. If anyone needs to know why, I can share the technical end of things, but basically, the attachment bar doesn't work well.