The question is too vague to receive a serious response. Here's why:
First of all, what's a "Domain"
A Banking Company or firm can include anything from customer analytics, credit modeling, churn analysis, fraud detection, standard financial reporting for BASEL II or just plain financial reports. In Canada, banks do a lot of insurance as well, including life, auto and property.
A Health Insurance Company can include anything from rate calculation along actuarial lines, patient profiles, financial reporting, claims analysis, fraud detection, drug usage analysis, research into treatments.
There are obviously some overlaps, but usually its subject matter expertise and terminology that are important. Variance in finance is A-B, while in other fields its the statistical definition of variance.
I've worked for Forestry, Human Services, Insurance and Health Care. The skills that are most important are knowing what questions to ask, and how to go about solving a problem, regardless of the field.
