Matching is harder than people expect. Profiles get discontinued, and colors more often. Even where the exact product is still made, siding that has weathered on a wall for fifteen years won’t match a new panel, particularly on a sun-facing wall.
The same issue can affect lap siding, wood siding and aluminum siding as well as vinyl. The profile, finish, age and availability of the existing wall cladding all matter.
In practice, a repair may be visible. Options include taking material from a less visible elevation to patch a prominent one, replacing a full elevation so the difference falls at a corner rather than mid-wall, or accepting the difference. A contractor should raise this before the work, not after.
When a repair becomes something else. If the inspection finds damaged sheathing over an area, or a flashing problem at openings causing the damage, a panel repair only treats the symptom. The honest answer then is a documented partial replacement or a recommendation for full replacement, with the reasons written down so you can judge it.