Alpha's are different from normal models, but not by much.
For the latest Vcore Pro models - the frame is 1mm thicker (22mm in the alpha, vs 21mm in the non-alpha); the graphite composition is a bit different as well (alpha features Nanomesh Neo, non-alpha has NAMD). Swing weight is closer to the 280g non-alpha version, but balance is closer to the 300g version.
Lastly, the Alpha models are manufactured in China, not in Japan, so QC may be a bit lower.
The little feedback I found about the alpha models (VCP or Ezones) has been pretty positive and people seem to be pleased with the build quality as well.