Related and Supporting Industries.

I think the clue is in the title e.g. related and supported.. There is no difference per se, they are connected.

these are resources that both support but are related to the industry, product line or organisation, it’s what makes them successful.

take Scottish whisky, farmers provide the grain, peat suppliers supply the peat, bespoke barrel manufacturers provide for distilling…

I don’t think you could class banks as related.

Hope this helps!