The tail cap and tube are identical on these lights, and they interchange freely.
The only part that is different is the head.
So you can mix and match if you please.
Just in case anyone wanted to know this useless bit of information.
Post it here What Legoes with What? 
Done
On my clear versions of each the tail caps are interchangeable but different designs. I ended up swapping them cause I liked the E01 design better and wanted it on my more useful E07.
Yup. The designs are different but they interchange
One thing that is different is that the E07 has a 15mm thick shelf vs 10mm.
But that would be in the head, which is different, but compatible with the other parts.