Good memeory Sid - I'll know where to come if I've forgotten about an old posting.
Actually there are more significant differences between the two cars than just colour although as you will know also, I have a huge soft sport for black 131s.
What the "creator" of this silver car has done that offends my idea of what is a tasteful modification and what isn't, is that he has attempted to "Abarthise" his car with bonnet, boot and roof spoiler changes - I think someone suggested that it is now neither one nor the other, (ie Sport or Abarth). I also dislike the colour discrepancy between the bumper/arches (it should be all silver for a cleaner look) and finally, the gold element in the wheels jar.
The black car on the other hand is a simple arches and wheels mod while retaining the look of a Sport far more successfully. I've always said the simplest way to make a car look purposeful is wider wheels and tyres - This is what the black car achieves while still resembling a standard Sport - Hence a cosmetically pleasing result...to my eyes at least.