The new sash is judged against the one it shares a wall with
On an attached street your work is compared with the house three feet away, in profile terms, by people who walk past it every day.
A subdivision colonial hides a window job behind a driveway and a lawn. A house on Capitol Hill or in Petworth shares a wall on both sides and puts its front elevation on a sidewalk the neighbors use twice a day.
So the comparison happens in the language of the facade rather than the language of the brochure. The width of a meeting rail, the muntin pattern, whether the new unit sits at the same depth in the opening as the one beside it.
Show exactly that. A slow pass along a front elevation where the new sash lines up with the original next to it is the argument in this housing stock, and no manufacturer graphic makes it for you.
Say what you matched and how you matched it. Sightline width, the depth of the reveal, the grille pattern, the color of the exterior face. Owners on these blocks already know those words, because most of them have sat in a meeting about them.
The failures are just as legible, which is the other half of the reason this works. A flat panel where a divided light used to be reads wrong from across the street, and once one house on a row has it, every owner on that row can see it from their own stoop.