This is a helpful resource when comparing a 2A and a 3A...
http://www.cj3a.info/cj3a/cj2acj3a.htmlTitle and vin #s are sometimes tricky on these old Willys. At the time, States had different rules. Some States used the engine serial number. Others used the serial number on the data plate.
Generally, an original engine will have a larger number than the data plate serial number. They were making more engines than CJ3As. They will never match. In your case, the title # might be the engine number. Look for this number on the flat area ( boss ) just behind the water pump.
An early 3A will have a data plate and a body plate mounted on the passenger side firewall...same as a 2A.
Most 2As will also have a frame tag. And most 2A frame tags were mounted on the front frame horn...outside edge...driver side. Late 2As and all 3As have no frame tag.
There is more, but this stuff should keep you busy for a while.
Tim