2208 FAC
Why would they build one boat in one shipyard and the second one in a different yard? The company that built the 2208 had previous experience in the same design of craft for civilian use. When a yard builds a boat like this, they have lots of special tooling, molds, jigs, etc. Usually if more than one boat is planned, they are built concurrently, with the second boat about 50% behind the first. This allows the molds, jigs, dies, etc. to be used sequentially.
Plus, the first pictures I saw of this boat several months back had the numbers covered up, the same as the pics you posted (I am almost positive they were the same pictures). I scanned back to the earlier threads, but the links are no longer functional.
IIRC, 2208 was launched in Arpil 2004. Typically a boat of this class would take 18-24 months to build once the design details were sorted out. A yard building 2 at a time could roll them out at the rate of one per year (or slightly better) if they were built concurrently (side by side in the same building).
It doesn't make sense that one would be built in Shanghai, then 6 months later another one would come out of a different yard. That's just not a practical way to build boats of this type. jmo.
I'm not saying it's impossible, if the PLAN has decided to put 8 or 10 of these in service in 2 years, they would need more than one yard. But why would they do that without first testing the concept?