Not really. Incel implies a level of indoctrination into a misogynistic POV that has you convinced that you’re better off alone. It’s not the same as insulting someone for simply not having had sex yet.

edit: not that I think either is a productive thing to call another person

Not at all. Incels are almost overwhelmingly misogynistic and into a lot of weird pseudo scientific shit. Incels are those claiming they deserve women but at the same time don't deserve them because they're too beta and all the rich alphas are getting 10 chicks a second, so they excuse their lack of success with dating in a lot of made up bullshit to delude themselves into never improving as people.

Incels are not just virgins, they're basically a cult, and thinking people use it just as 'virgin' is either deliberately obtuse or ignorant