How are long COVID and MS related?

Are they both diseases that are due to viruses that continue to attack the body long after the virus first infects the body? Are viruses like COVID-19 and Epstein-Barr attacking the body in a similar fashion? Can research in both long COVID and MS be applied to one another? I see so many long COVID symptoms that are similar to MS symptoms, like fatigue and brain fog. It's also curious that long COVID seems to be due to a virus that lingers in some people's bodies. There are so many similarities that there has to be research done in one field that can benefit the other. I would also assume that there's money available for long COVID research that isn't available to support research for other diseases that could be due to viruses. There has to be a way to capitalize on funding and the long COVID research to benefit more than just long COVID.