The Bonhams watch is a frankenwatch. I know of no Seamaster XVI's made in any other metal but solid gold. The dial on that one may be original, can't tell from the picture.
The watch above seems to be correct in all aspects except the dial, which is an OK refinishing job. I would want to make sure of the movement condition before offering to buy. If all is correct under the hood, it's probably a $1K watch as is. Maybe a bit more, as the case seems to be in very nice condition.
Now if you could only swap dials with the Bonhams watch.....🤔
gatorcpa