They are not. Im a huge fan, but if I imported any of the Mega Man Collections for the Switch, I would just get half the content anyway. Ill just import the PS4 version of the X collection like I did with the first.
I'm not even bothering with them at all. I was interested in the Legacy Collections until I found out they were digital only in EU, and all of a sudden my interest plummeted... not sure why they'd leave us out on the physical copy front of things, but whenever that happens, I simply refuse to buy the game(s)... call me petty, but meh.