"differ essentially" is a correct and usable phrase in written English.
It is typically used to indicate that two objects, people, or concepts are very different from one another. For example, you could say, "These two goals differ essentially, as one focuses on short-term outcomes and the other focuses on long-term outcomes."
Some 50 years ago, the renowned linguist Roman Jakobson pointed out a crucial fact about differences between languages in a pithy maxim: "Languages differ essentially in what they must convey and not in what they may convey".
In this sense, phase change and related phenomena do not differ essentially from those of differentiation and organogenesis in general.
Bait casting and spin casting differ essentially in the type of reel, the rod length, and the strength of the line used.
In sexual reproduction, a new individual is produced not by somatic cells of the parent but by sex cells, or gametes, which differ essentially from somatic cells in having undergone meiosis, a process in which the number of chromosomes is reduced to one-half of the diploid (2n) number found in somatic cells; cells containing one set of chromosomes are said to be haploid (n).
They differ essentially on the variability of the input items.
This approach is justified only when bifurcation loads for both problems differ essentially.
This common language is understandable because the monotheistic conception of God differs essentially only in one respect from that of other religions: in the belief that God is one and absolutely unique.
So, BVP (1.5) differs essentially from BVP (1.4).
Our technique differs essentially from the one used in Hinrichs and Vybíral (in press) [7].
The parameters of the model are identified from the mechanical response and transformation kinetics measured under uniaxial tension for two steels differing essentially by the austenite stability.
However, it differs essentially from RANSAC in that RANSAC only utilizes keypoint positions, i.e., in RANSAC, the sampled combinations are assessed with the number of correct mappings in the rest.
