PPS - Sorry - I just re-read your post and realized that you are already quite close to the effect you want to achieve, so just ignore my previous post.
Since you didn't state which difference most concerns you between your first and third images, we have to guess. Ignoring the relatively easy-to-fix differences in overall level of opacity of the effect, differences in level of detail in the barn, differences in color saturation in the transition region, etc., the next thing that catches my eye is more erosion of the OOF branches just above the subjects' heads in the 1st image.
My guess, and it's only a guess because the metadata has been stripped from the 1st image, is that it looks like you may have closed down the aperture a bit going from the 1st to the 2nd photo that you posted. This would lead to the OOF areas being a bit harder and a bit less eroded in the 2nd shot. If this is what concerns you, please let us know and we'll try to address it.
Tom M
PS - If you are not familiar with erosion of highlights, have a quick read through the discussion
HERE (search within this page for the section titled, "Photometric burnout", or simply scroll about 80% of the way down). Note that Rosenman occasionally calls this effect, "corrosion", although I think the favored term is "erosion" or "burnout".