Hi. Yeah, some of the parts are different, but they seem to share the the same block and bore size. The training docs that I was reading say that they changed the piston design, the piston rods and the crankshaft from the original FE engine. I get the feeling that if I take my FE engine and swap cylinder head, crankshaft, piston rods, and pistons, it should work. Can't think of a reason why it wouldn't, but I don't consider myself thoroughly knowledgeable either, so it's likely that I'm wrong, but I was hoping somebody would have already tried it or tell me more precisely why it won't work.
The following is text from the training manual when the MX6 came out with the F2 engine. The manual also says that the pistons, crankshaft, cylinder head, and piston rods are not interchangeable, but I think they mean it individually because if you change the crankshaft, then the old piston rods won't work, etc. However if you change the whole group of parts that mesh with each other, they should work together. It says that the piston rings are interchangeable and so are the piston pins and crank pin bearing:
OUTLINE OF CONSTRUCTION
The New 626 is equipped with an F2 2.2liter engine. This engine is based on the previous 626 FE
engine, with increased displacement. The engine features three valves per cylinder and a new timing
.1. The piston stroke is increased for greater displacement
2, Intake and exhaust efficiency is improved through the use of two smaller rntake valves and one
larger exhaust valve per cylinder, for an increase of total valve area.
3. The timing belt layout is changed for improved durability and noise reduction.
4. A stiffener is used between the cylinder block and the oil pan to lessen noise and improve performance.
R The cylinder block and crankshaft strength is improved to meet the higher power output.
6. Hydraulic lash adjusters are used to reduce noise, thus the valve clearance is made maintenance-free.