Modern L Shape Modular Kitchen Design With Persian Vertical Walnut Cabinets

No - vertical and horizontal grain versions of the same laminate reference are typically the same price from the same manufacturer. The visual difference comes entirely from the orientation of the grain in the laminate print rather than from a different manufacturing process or material composition. You're paying for the same material. The grain direction is a specification choice within that material rather than a cost variable.

With the right lighting specification - no. With inadequate lighting - yes, genuinely. The distinction is important because it means the lighting specification is as critical as the material specification in a full walnut kitchen.
Warm under-cabinet LEDs above both the upper and lower runs, recessed downlights distributed across the ceiling at adequate lux levels, and a light cream countertop running the full length - these three elements together keep the kitchen feeling rich and warm rather than dark and heavy. Remove any one of them and the balance shifts. The full walnut kitchen is a design that requires its lighting to be properly specified and installed from the beginning rather than added as an afterthought.

Cream or warm white large-format tile - neutral enough to let the walnut grain do the work without competition.
For a more luxurious pairing, travertine or limestone sits naturally within the same warm, organic palette as Persian walnut. The ceramic version is practical and resolved. The stone version is exceptional. Worth raising during kitchen cabinet design planning before materials are ordered.

Yes - and the contrast can be genuinely beautiful if the second material is chosen with the relationship in mind rather than independently. A lighter wood tone creates a material contrast within the same natural family - the two woods are in conversation rather than conflict. Matte white or cream panel on a kitchen island or a specific tall unit column provides a designed material break that highlights the Persian walnut of the main cabinet run rather than competing with it.
This approach is becoming increasingly popular in Indian premium kitchen design specifically because it allows the warmth and depth of walnut to lead while giving the kitchen a visual focal point that prevents the single-material run from reading as uniform. A rough modular kitchen estimate based on your actual kitchen dimensions gives you a realistic cost anchor before contractor conversations begin - the mixed-material approach can move the budget in either direction depending on how it's specified.

Premium wood-grain laminate with IS certification and a kitchen-use rating handles years of daily Indian cooking without issue. The critical variable is brand quality - lower-quality laminates bubble and delaminate near the sink and hob over time; premium ones don't.
Specify by brand and certification, not price alone. The cost gap between mid-quality and premium laminate is small relative to the total kitchen cost, but the performance difference over ten years is significant. A choice like this runs through the house interior design every day - not just on installation day.