Are they both sustainable timbers?

What markings are on it? Is it full hardwood or engineered flooring or laminate?

These markings indicate sustainable timber

We once had tassie oak kitchen cabinets and they darkened very quickly when they were exposed to sunlight.

What company is supplying the wormy chestnut? Some companies claim theirs is sourced from the Vic Govt, and is certified sustainable. It mainly is cut in East Gippsland from old growth forests. On the other hand some suppliers are saying its from rejuvenated forests some years after bushfires

So both types of timber come from old forests.

Wormy chestnut is now in fashion because of its lovely markings, as the trees often grow twisted.