The eBay one is listed as being suitable for Stefanelli as well as Romano. Romano is usually AEB but I don't thing Stefanelli is so it may not work. The LPG kits one will and if it doesn't you'll be talking to a man in Norfolk not being ignored by someone in a different country.
Good points both.......
The Stefanelli one he lists is plug 13 - Not one of the ones in his universal kit so its probably a peculiar one (wiring could be different to anything else). So I'd suspect that the lead will only work with Stefanelli and nothing else. You need a laptop to use it on though, If you have a serial port on the laptop get that type of lead for preference, otherwise it will have to be the usb type.
If you have access to the obd side can you see any live sensor data? That might help you more than fault codes, as you can get an idea with any luck on what the o2 sensor readings are showing, which can give some insight into whats going on. Its not always possible with an off the shelf reader though, varies greatly by manufacturer and age of vehicle. What are you using to see the fault code you have listed (app on a phone or a handheld reader?)
It may be that the ebay listing is for a few different cables - if you translate this section
Wichtig: Informieren Sie uns nach dem Kauf bitte, welche LPG-Anlage Sie genau haben...danke !
Importante: Fateci sapere dopo l'acquisto si prega di quale sistema GPL...grazie!
Important: See which LPG system you have us exactly after purchase please ... thank you!
I'd be suspicious of a listing that says its located in Germany but gives a Russian web address for tracking though. In the event of any problems you have somewhat better chance of getting it resolved by the other one thats listed.