CND Engines vs. Bio Gas Engines

CNG or Compressed Natural Gas is basically methane gas that is pressurized. Biogas is also methane created by by the decomposition of organic material. Any engine designed to operate on CNG can operate on biogas, you just need an appliance to compress it.

PMoon - What will be calorific value Kcal/kg of CNG & bio-gas?

Thanks ,

Can I use bio gas in my car at same set up of CNG.