The phrase 'completely differ from' is correct and usable in written English.
You can use it when you are wanting to describe something that contrasts with or is different from something else. Example: The male version of this dress completely differs from the female version.
GO annotations did not completely differ from each other, with many ESTs involved in different classes of functions and annotated with multiple GO terms; similarly, a single GO term was sometimes found to annotate several ESTs.
Each neoplasm exhibits molecular signatures – sometimes in a patient specific manner – that may completely differ from the organ of origin, may be expressed in markedly higher amounts and/or in different location compared to the normal tissue.
Without using a preprocessing stage based on orientation invariance, the 2048 inputs of the classifier would completely differ from an image to another although the basic shape of the particle would remain the same.
While the new processes completely differ from thermite welding in means of used materials, the concept of using the energy emitted by a self-sustaining reaction for bonding is comparable.
Again, these studies were conducted in developed economies where the systems in the labour market completely differ from those of developing economies like Ghana and were also not specific to the youth.
The properties and behavior of extremely small gold particles completely differ from those of bulk materials, e.g., their melting point [2, 4, 5], density [6], lattice parameter [6 8], and electrical or optical properties [6, 7, 9] are dramatically changed.
This implies that Problem V completely differs from the majority of existing reduced-order models (see, e.g., [11 16]).
In terms of development aspects, Native application completely differs from a Web application optimized for the iPhone excluding some similar tools in the SDK.
This type of data completely differs from forum-type data both in terms of data structure and means of information exchange.
The survey questionnaire binary asks "Did you launch following product innovation for last 3 years (2005 2007) in the market?" and it request to select out of three criterions which are: 1. Launch new product completely differs from existing product, 2. Launch highly improved product compared to existing product, and 3. None of these are applicable.
