A Protank or Protank 2 head will fit into an EVOD. The extra length is all on the chimney. That extra length easily slides into the center tube on the EVOD tank.
The dual coil Protank 3 is another story, it WILL NOT fit into the Protank/Protank 2/EVOD configurations because the coil base on the Protank 3 is larger to accommodate for these dual coils.

Vape onnn...