When comparing other lower end interfaces to higher end ones yes, there is usually a difference. The same is true of most manufacturers there's a reason higher end interfaces cost more.

The 24c has slightly better specs than the AB96 when it comes to AD/DA converters
but it also has, perhaps more importantly higher quality XMax preamps as well as a
host of other features lacking on AB96.

You get what you pay for.

In the future I recommend you do your own homework. The tech specs for all Presonus gear
can be found in the Product pages:

https://www.presonus.com/products

That being said we can help you better now and in the future with a bit more info......if you will post your system specs in your signature, (see my sig), we will be better able to troubleshoot your problems. Without knowing what type of pc you're running, what OS you're using, what DAW, make and model of your audio interface etc....we often can't recommend a "simple fix"

If you have not already done so please READ THE MANUAL!