A ram is a ram--but they are quite different in several respects.
First, there are two species, Mikrogeophagus ramirezi is the common or blue ram, and Mikrogeophagus altispinosus is the Bolivian Ram. The latter is not available in "variants" as far as I know, whereas the common ram is--the balloon (don't buy these, they are deformed), gold, german blue, electric blue, and whatever else someone may have dreamt up.
The care for the common ram variants is basically the same. Wild rams can be a very different story. This fish is highly sensitive to water parameters (hardness, pH and temperature) and wild fish need very precise aquaria conditions or they simply will not live long. This is explained more in our fish profile--click on the shaded fish name in posts to see that fish's profile, or use the second tab from the left in the blue bar at the top.
Wild fish do tend to be more colourful in general, without the "enhanced" colours of the various morphs.