is there a difference between pct and cna?

Probably depends on where you work but not much difference. Where I work we call them PCAs

If you use the "search" feature in the upper right corner of the page and search on "pct cna", several previous threads come up. Here's one of them:

https://allnurses.com/cna-ma-nursing/pct-cna-whats-327385.html

well im signing up for a program to train nurse aides but in my application it asks why do you want to become a pct

is there a difference?

At my facility PCTs are able to perform certain procedures, such as inserting catheters. They are usually hired on for the ER but do float to other floors as CNAs.

At our hospitals PCTs can operate as unit secretaries, basically. They can enter orders and be assigned to answer the phone, call in consults, send faxes, etc. CNAs do the patient care end of it. A PCT has a CNA license, with additional responsibilities, but can be pulled off the desk to function solely as an aide.

In Florida, a PCT is a CNA that can do additional stuff, like insert Foleys, start IVs, etc.

They do vitals and accuchecks as well, but I'm not sure whether CNAs can also do that - I think so.