While the body of this verse ending the parable looks similar to the verse that preceded the parable, Matthew 19:30, Jesus is playing a trick on us. In the beginning, the "first" was the first idea. Here, as the end, the "last" comes first.  So this is the opposite of the first interaction. Does it mean the same thing? Yes, because the equations balance in either order, which is Jesus's point.  This verse also adds definite articles to two of the adjectives,  making them act like nouns, "those first" and "those last."  Here, of course, he is referring to the "those" in the story. However, there are two types of "first" in the story: the first hired and the first paid. Those last hired are the first paid. The first paid, however, at the last hired.  How we translated these words also changes the meaning dramatically. For example, "In this way, however, those lowest will be highest, and those highest, lowest."

This is a great example of a translation that is meant to highlight one possible meaning and obscure all the other possible meanings. All these adjectives have several different meanings depending on their context. If the context is "the realm of the sky," then a sense of "first" and "last" could well be "highest" and "lowest," especially since these words could refer to people's feelings at the end of the parable.

The first is that the second part of the KJV verse doesn't exist in today's Greek sources or in most modern bible translations.