Combustion chamber is different, noted by a foremost authority of 1FZs when asked his opinion on an
eBay offering a few years back.
Assuming low octane, SA market or possibly industrial applications, but, if other non-US of the same lineage are indicative, possibly lack hardened valve seats.
Short of that, largely the same, the FE having a block off plate where the fuel pump mounts on an F. Manifolds interchange, as does everything else.
1FZ blocks are the same, regardless, no matter the head or transmission.
(All the above stated with the disclaimer that the above doesn't extend beyond '97)
Begs cobsuderation given to a new FZ shortblock.
Going to the expense of buying an unknown engine, simply for the block, could be a Pandora's box unleashing a flow of expendable cash that could exceed the $3,400 premium for new.