Actually it's more similar to a ball python and a burmese python. Not a butter and a lesser. THese animals are different species entirely. These people are trying to help you, don't be so dismissive.
It turned into this because taxonomy is important. Knowing what you own is good in order to provide proper care.
ALso, although in the same family, melinus is more similar to the mangrove monitors and grows a bit larger than the true tree monitors.