by RonPurewal Mon Aug 31, 2015 5:48 pm
yes, redundant ***IF*** they're referring to the same comparison.
if they are parts of two different comparisons, then the sentence could be perfectly ok.
e.g.,
At Burger Queen a large drink costs only 15 cents more than a small drink, compared to a difference of 25 cents at Burger Princess.
this sentence is fine, because the two constructions are used to make two different comparisons. ('more than' is used for prices, whereas 'compared to' is used for the differences in those prices.)