Yep. You shouldn't have any trouble at all with those radii.
The Europeans typically use tighter radius on home layouts because space is at such a premium and houses and apartments are not nearly as large as they are here.
90' passenger coaches have no problems with 18" radius curves, but they don't look good going around.
Some manufacturers overseas actually scale their passenger cars at 1:93 instead of 1:87 scale. Märklin typically manufactures coaches under scale, but most of them do offer a selection in their hobby lines that are under scale. You have to pay attention to what you are buying in order to get full scale coaches. Full scale coaches are 303mm and underscale are typically 287mm or there abouts.
I have a couple of ÖBB coaches like that, and they do look better going around the 19" and 20" radius curves on my branch line. I also have a set of Fleischmann TEE coaches, that are 1:93, but they are so close to full scale that you can't tell the difference unless they are sitting side by side with a full scale coach on a parallel track, and even then the casual observer will never notice.