The phrase "a different portion of" is correct and usable in written English.
It can be used when referring to an alternative or distinct segment of something, such as a text, a dataset, or a physical object.
Example: "In this study, we will analyze a different portion of the data to see if the results vary."
Alternatives: "another part of" or "a separate section of".
It turns out that there was an increase in a different portion of the electorate.
Every class uses a different portion of Battlefield 1's varied and unique arsenal.
The myth of the Pilgrims, for example, comes in many shapes and sizes, each containing a different portion of factual accuracy.
Knutsford is offering WILink shareholders a choice of one of four packages, each with a different portion of stock, cash and notes.
Henri Deglane, Albert Louvet, and Albert Thomas were each assigned a different portion of the building to design, while the whole project was overseen by Charles Girault.
I could have 50 managers who all deal with a different portion of my life, but I can only have one mother.
The rate of 2.21%/Myr (within lineages) that we estimated is very similar to that obtained in a recent survey of Chromis using a slightly different portion of the cyt b gene (2.36%/Myr; [ 85]. The closure of the Isthmus of Panama was used in several other studies to estimate mutation rates in reef fishes (e.g.: [ 35, 86- 88]).
It turned out there are three single-unit DNA variations associated with diabetes, and each falls in a different portion, known as an intron, of the calpain-10 gene.
Since they are both designed to choose high-confidence targets using different datasets, they may each be predicting only a small (or different) portion of the true transcriptional regulatory network.
The two or more catfish genome sequence contigs that had sequence similarity with a single gene could be from different portion of the same gene (e.g., different exons of the same gene, but yet there are gaps in the draft genome sequence), or from duplicated genes in the catfish genome (see below).
They also measured the amount of moisture and other properties of subjects' skin by placing a probe on different portions of their faces.
