To me the first picture seems to contain dark bluish gray pieces while the other two look like light bluish gray. Especially since the Wheel 18mm D. x 14mm with Pin Hole, Fake Bolts and Shallow Spokes was never officially released in any of the old grays, just Light Bluish Gray (and a bunch of other colors that are impossible to mistake for old gray).
Additionally, all the plates here have been released in a lot more sets as their "bluish" versions than in the old "light/dark gray" colors, so unless your collection is known to be composed of older sets, statistically it's much more probable that a random sampling of these pieces would be the new, "bluish" versions. For example take a look at the Plate 4 x 4: it was released in more sets as light bluish gray, as in both old color variants together, and in even more sets as dark bluish gray. The number of pieces in those sets is even more extremely skewed.
|# of sets
|# of pieces
|Dark Bluish Gray
|Light Bluish Gray