The difference is that Hunter was not a leading figure in propagating the president's policies. Don Jr. is. I mean, I don't think Hunter even has a Twitter account.
#RepublicanFalseAnalogies
I just got off a Facebook group which said that it was a hoax. So I guess it doesn't exist.
Google Coronavirus hoax and see what you come up with. Lots of nobodies.
Here's an article about this phenomenon.
https://www.livescience.com/conspiracy-theorists-claim-coronavirus-pandemic-hoax.html