And numbers don't always line up easily for chasing parts, especially with the VS111 model.
Although in my case it was a v6, they couldn't figure out what parts were required even with the engine number from factory, as it matched an earlier set of digits, but required the later model spares.
The other possibility could have been it was a Friday build.
My VZ has 2 engine numbers stamped on it, as they accidently doubled up somehow. Could always have been an error like that.
Unless there was an engine swap.
However I would say EYY is pretty spot on with the prefixes.