Andre pretty much hit it. Another way to explain it is:
Listeroid (and Petteroid) both refer to Indian made copies of original engines, Lister and Petter. The Listeroid is a copy of a Cold Start Lister; two flywheels, vertical cylinder, water cooled. Petteroid is one flywheel, vertical cylinder, water or air cooled. Changfa is a Chinese made horizontal cylinder, single flywheel, hopper type water cooled diesel.
EPA is the Environmental Protection Agency and is doing regulations on diesel engines for pollution control. Others can tell you exactly what those regs are. Mostly they threatern to stop the importation of Indian Listeroids & Petteroids and perhaps stop the use of any diesel in the USA. However, Andres' definition means just as much as any.