Hi jackb,
There are several options that can accommodate the needs and preferences of a couple that are very different (see the first part of post #2 here).
Twin XL mattresses or mattresses that work well for two different people (which can be confirmed with your own local testing) are widely available everywhere but side by side split layering in a single mattress is more commonly available with online retailers or manufacturers and are more common with latex or latex hybrid mattresses. Depending on where you live, these types of mattresses may also be available locally as well.
In most cases no … or at least not to a degree that it would make a meaningful difference for most people.
Phoenix