You only no when you have the same pipe is wen the EFRA name is in front off the number no efra in front off the number its not legal and a knock off !! :
Sirio efra 2013 is exactly the same as the RB efra 2013.
Novarossi efra 9853 is the same as the JP/Mega/Top/Rex 9853
Novarossi efra 9886 is the same as JP/Mega/Top/Rex 9886
OSmax efra 2042 (also now as 2060) is the same as the Ninja efra 2042
Company's like Dynamite, Ofna, HongNor have pipes that have just the numbers like 053 or 086 stampt on it.
These are just look a likes off the real Efra approved pipes from Novarossi.
The shape my look the same but the material used is not, also the performance may not even come close to the Novarossi pipes.