There's a link in a number of ways, but one of the most important ways in which there is a link is that financial abuse may be what is causing the neglect.
If there's a situation where an adult has allowed someone else to have control over their finances through a power of attorney, for example, you may see an older person who is missing basic necessities that you think a person with their level of income should have, such as food. Maybe the fridge is empty. Or maybe they don't have the assistive devices they need. Maybe they don't have transportation to get to community events to keep them involved and reduce social isolation.
If the person in charge of the finances is not making sure that the money is being spent to meet the needs of the older person.... Sometimes there's confusion among people appointed under power of attorney about what their responsibilities are.