http://www.tms.org/pubs/journals/JOM/matters/matters-9511.html
Seems to give me the brief on the difference in terms.
In response to your dictionary definitions, I was hoping to cite a case explaining/establishing the respective meanings. It's just easier to point you to Landis and you'll see the case citations in the footnotes. If you're curious, look up the cases themselves. It's not exactly light reading, but it's not impossible either.
1.) Can you amend claims with those terms (swap "consisting of" for "comprising")?
Well, eventually you'll see that the answer to every patent law question is: "It depends." The short and generally correct answer is "Yes." But there are exceptions.
As with all amendments, it must be supported by the specification. Remember, the amendment from "consisting of" to "comprising" (or vice versa) changes what the claim covers and the change must not add "new matter" to the application.
Suppose your detailed description repeatedly makes the point that the thing that makes your invention work are some five elements
and the exclusion of everything else. It's quite rare, but it happens. You might find that the examiner will find that your specification doesn't support changing "consisting of" those five elementes to "comprising."
And, even if the amendment is supported, it might render the claim unpatentable. Consider a claim "consisting of" A+B+C with prior art teaching A+B+C+D. Changing the claim to "comprising" renders the claim anticipated by the prior art. In theory, the amendment should be permitted and the claim rejected as not novel. So, I suppose, technically, you
can make that amendment but it won't result in an issued patent.
Of course, there may be other ways to broaden that claim and get around the prior art, but I'll save that for another time.
For what it's worth, I don't think I've ever used "consisting of" in my 13 years of practice. Of course, I'm sure in some deposition some day, some lawyer from the other side will find one and call me a liar. Occupational hazard....
Incidentally, for all practitioners out there, I have had a usenet post of mine shown to me in a deposition and I was asked questions about it under oath in front of a video camera. Yet another occupational hazard.
Regards.