Answer:
The last of the Coronavirus one and the first of the Bubonic ones. When Coronavirus started, technology and medicine had already advanced a lot. On account of this, we know ways to keep the virus from spreading and ways to possibly prevent it even. During the Bubonic Plague, however, they didn't know this. Instead what they largely had to protect themselves was staying away from people, hoping and/or praying for their safety, and whatever supposed methods of cure were proposed.
The colors in the Coronavirus one are brighter, besides the fact that the amount and shades of easily usable painting colors has increased since them, it reflects some of the brighter nature of the painting in terms of its meaning, which is that we can beat Coronavirus. The style of the Bubonic Plague painting, however, is more realistic down to it having a natural background to it for example. This could be to show how the painting emphasizes how death was always with them, everywhere. The emotions of the Coronavirus one are more hopeful-we can beat this if we prepare and react accordingly, as shown by how they're wearing a mask. The emotions in the Bubonic one are less hopeful as it emphasizes more how death is everywhere to the point that, based on the person's expression, it's barely a surprise to meet it yourself.