Let's carry this a bit farther. Instead of comparing two vehicles made by the same manufacturer and designed by committee (which suggests multiple designers), let's take a look at a Jeep Grand Cherokee and a Ford Explorer. Both are intermediate size SUV's that come with V8s. They both have 4 doors, electric windows, and heated seats. In fact the similarities are far more numerous than the differences. These two vehicles are not only made by different companies but designed by different designers. Just as different engineers will approach the same design problem with different solutions, to such a degree that the designer of some constructs can be identified by the techniques used, the identifiably different techniques used to 'design' biological life shows evidence of multiple designers. In fact it suggests a different designer for every Family.
The engines of those two cars are the descendants of the original V8s from the '50s. They both have dish pistons, one intake valve and one exhaust valve, roller lifters, 1.6 ratio rocker arms, and multiport injection. The original V8s had flat or raised pistons, solid lifters, and carburetors.
I suggest that the differences between the old engines and new engines is not simply design. The engines have in fact evolved.
Changes in the morphology of the engines are the result of changes in environment. They were made because fuels changed and horsepower increases were demanded by purchasers (Selection forces). The only way to deal with lower fuel octane ratings and still keep costs down (water injection is costly in upkeep) was to lower compression. The change to 'dishing' of the piston tops was 'forced' on the manufacturers in order to lower compression and enable the engines to survive low octane.
Because more horsepower is related to the amount of fuel/air mixture available to the combustion chamber, the manufacturers had a choice between increased chamber size or increased flow into the chamber. A larger chamber is more costly than simply increasing the ramp rate and valve lift of the cam, so a higher lift cam was selected. Neither high lift solid, nor high lift hydraulic non-roller lifters are capable of surviving for any length of time in a daily driven vehicle so the manufacturers were in effect forced to choose cams that use roller lifters. They found that these cams and lifters put enormous stresses on the heads, which developed a tendency to twist. They were forced to add taller ridges to the circumference of the heads.
It becomes obvious that many of the features of V8s (and other similar engines) were not designed, but the result of human selection, economic considerations, and the laws of physics. They evolved from simpler, less complex engines.
We know that DNA in cells contains much of the information necessary for the development of an organism. In other words, if two organisms look similar, we would expect there to be some similarity also in their DNA. The DNA of a cow and a whale, two mammals, should be more alike than the DNA of a cow and a bacterium. If it were not so, then the whole idea of DNA being the information carrier in living things would have to be questioned. Likewise, humans and apes have a lot of morphological similarities, so we would expect there would be similarities in their DNA. Of all the animals, chimps are most like humans, so we would expect that their DNA would be most like human DNA.
Yet the differences show indications of different designers. It is easy to see that the common DNA sequences are necessary for similar features, but those genes that are the same but show different features and the genes that are different but result in similar features are hard evidence for more than one designer.
There is only one God, but we can infer from the many design styles a number of different designers. Therefore, biological organisms were not designed by God but by a race of aliens.
Proof: We are nothing but alien zoo specimens.
Great post!