A funnel conversion expects a particular way before the objective. For example, suppose you run a campaign for Widget An utilizing a presentation page with focused activity. You want to see the funnel conversion rate for that landing page, add to cart, then thank you page (in that specific order) to gauge the effectiveness of your campaign. You see that specific funnel conversion rate is 2%.
For a goal conversion rate, all you care about is maximizing a conversion rate overall, all you think about is augmenting a transformation rate generally speaking. Suppose that objective is basically to build Widget A’s transformation rate (on your web properties) paying little heed to whether clients enter by means of that point of arrival or go to your general site.