The vans are code LGH, at least for the last 8 years or so, which is just a slightly detuned version along with some other minor changes, of the corresponding truck year engine. For example mine is an LGH brother to the LML since it's a '15.
I'm not sure if that changes anything at all regarding the 8th digit though. Guess I could go lookup mine.
2015 Chevy Express 3500 Duramax
w/ Quigley 4x4 & Agile Fox shocks
Sold 2005 E350 Chateau
Quigley with Agile RIP, 6.0 PSD