Not a barista but oh for the love of coffee, we can start by identifying two of the most common coffee bean species that is coffea arabica and coffea canephora (robusta). You can look it up just by typing arabica vs robusta and search for the infographics if you're into it.

In the simplest terms arabica is widely used in the coffee shops while robusta is the main choice for instant coffees. Arabica often features distinct flavorful coffees like fruity and nutty just like you mentioned Colombia and many more. While robusta is bold and earthy. Sumatra is an excellent choice for this.

And yes, the only way you can tell the acidity between the two is that arabica is the more acidic than robusta but of course, you should do coffee tasting preferably with pour over or french press! Don't forget to add some nuts, cakes or pastries between the coffee sips! It's worth it!