Back when I used to own a 2004 Acura TL, the same suspension could also fit 2004-2008 Acura TSX's and 2003-2007 Honda Accords. I ran many different set ups, one being TEIN Springs + Koni SP3 shocks from a 4 cylinder accord.
The springs had a softer spring rate, so the ride wasn't harsh but definitely was more prone to bottoming out if you're not too careful (never had it happen to me). With that said, that was one of my best suspension set ups paired with Koni Shocks because of the slightly softer ride and with a slight rake look.
You're not gonna destroy your car running the civic set up if it fits, but just reiterating what stated, it wasn't particularly designed for our cars so it may ride a bit softer with a slightly lower drop that stated.