Originally Posted by JSensei

Actually, you're off on this one. There are two new cards for 4-2 (both N), AND two unrelated cards for the bonus area. They are not available on any of the previous routes unless they have changed the routes. I suspect, that one of the earlier routes got changed and they were added there.

Either that, or they are exclusive to the bonus area.

For what it's worth, they seem to have a higher encounter rate. It took me about 1000 stamina to get them, but I got them both.

Maybe, i remember at least one card replacement with an earlier E gacha card