I suspect that the university equates the word "identical" with "same", in which case it would make sense to use "with", since we say "same with", not "same to", do we not?

However, I find that "identical to" is more accurate, since I connote "identical" with "equal". To say something is identical ais to say that it is exactly the same as another, or simply, equal.

Since we say "equal to", not "equal with", personally I believe "to" is very rightly used more commonly. i'm no authority of course, but this reputable university is simply being elitist in my opinion.