Pro Tools does not record 32 bit files. If the files are from Pro Tools, then they will be 24 bit or 16 bit. Logic will import those without any conversion just fine, I do that all the time. You will only need to convert the sample rate if that doesn't match. Logic will display what the files are (sample and bit rate) in the import dialogue.
if the files are 32 bit, the process gets a little more complicated. (I've had bad luck anytime I've tried doing anything with 32 bit files) You would need to find a way to convert them to 24 bit before Logic would be able to see them for import. There are a few options that might work for that. Cubase, Peak and Sample Manager would be the first that come to mind.
Hinder Quality? That depends on what and in what context. The simple act of converting isn't inherently bad. The only way to know for sure is trust your ears. Do you hear a difference after converting? Is it acceptable?