Ok, here we go...
The original "CP" posted has a serial number of 04008** (will be called 800)
The 2nd more recent acquisition has a serial of 04003** (will be called 300)
Both guns have the same 18.75 inch barrel.
Both guns have the same basic cutout for the bayonet in the stock.
Both guns have similar repairs to the stock comprising an oval inlay.
800 is restained, has a replacement gas tube and the addition of a bayonet and shortened, replacement cleaning rod.
300 has a cleaning rod that appears to have been shortened during commercialization, a hard rubber butt pad and the original finish. No bayonet was with the gun. The seller apologized repeatedly, and cited this as being a reason for a lower price.
Both guns have all serial numbers scrubbed on all parts in the same fashion. Both guns have a digital style font serial number that has been scrubbed and overwritten with the current more visible serial number.
Trigger groups are different. 300 is either cast, or has rust pitting that has been cleaned and refinished.