Carapils aka dextrine malt doesn't contribute any noticeable caramel flavour. It addes dextrines which add head retention and body.
Caramel pils is more of a typical caramel malt. Think of it as a little bit lighter than Crystal 10. It's going to have a very soft and faint caramel flavor. I wouldn't expect a big impact from the switch up, unless it's 10% or more of the grain bill.