Here is a comparison of typical defensive handgun speed projectiles. In it, clear gel is very highly correlated with organic gel:
https://m.youtube.com/watch?v=1kjcoFaobeo
Here is another test, but the clear gel was not properly calibrated:
https://m.youtube.com/watch?feature=...&v=KizfONaOVV0
The results diverge as you start getting into rifle type velocities:
https://youtu.be/KizfONaOVV0