the state requirements for matching on an RCV policy is usually based on a regulation, sometimes a statute, and often with some case law to boot. The California regulation doesn't mention paneling specifically. Then again it also doesn't mention shingles, stucco, paint, baseboards, carpeting or any other specific material for that matter.
Here is the California code Section 2695.9.
Additional Standards Applicable to Fire and Extended Coverage Type Policies with Replacement Cost Coverage
(a) When a fire and extended coverage insurance policy provides for the adjustment and settlement of first party losses based on replacement cost, the following standards apply:
(1) When a loss requires repair or replacement of an item or part, any consequential physical damage incurred in making the repair or replacement not otherwise excluded by the policy shall be included in the loss. The insured shall not have to pay for depreciation nor any other cost except for the applicable deductible.
(2) When a loss requires replacement of items and the replaced items do not match in quality, color or size, the insurer shall replace all items in the damaged area so as to conform to a reasonably uniform appearance.
That last sentence is why undamaged carpet in an adjacent room can be paid for on an RCV policy, and that sentence is often referred to as the "line of sight rule".
I believe the whole "line of sight" wording comes from case law, I don't think those words actually appear in the regulations.
Here is a link to Kentucky's fair claim practices regulation, which has similar wording with the addition of wording that it applies to both interior and exterior.
http://www.lrc.ky.gov/kar/806/012/095.htm Here is the Rhode Island regulation:
When a loss requires replacement of items and the replaced items
do not match in quality, color or size, the Insurer shall replace all
such items so as to conform to a reasonably uniform appearance.
This applies to interior and exterior losses. The Insured shall not
bear any cost over the applicable deductible, if any.
In Minnesota there was a well known case where the judge ruled that the exterior siding on an RCV policy needed to match, and since the old siding was no longer manufactured, the insurance company had to pay for all four sides.
So what you have in Minnestoa is a statute or regulation which probably does not specifically mention exterior siding but a judge ruled it that it applied to exterior siding. So now you have case law that specifically mentions exterior siding, but not a regulation.
So a Minnesota insurance company could theoretically decide that interior paneling was a whole different animal and they could refuse to follow the case law on exterior siding but I don't think this would be a successful approach. They would be shot down by the judge because the issue is so obviously similar and the statute or reg would apply the same way the first judge decided.
In this scenario it would be correct in a very narrow sense to say that Minnesota doesn't have a law regarding matching interior paneling but it would be misleading, because the case law regarding exterior siding obviously applies to shingles and carpet and linoleum and paint and tile etc etc.
It's like saying it's not illegal to drive 93.25 miles per hour. Technically that's true, but it is illegal to drive over 65 in most places so what's the point of splitting hairs in that narrow way.