Is there any difference in quality of the CD copies if you make them or I make them on my computer?

We do not put any copy protection on the CD’s, so in theory you should be able to make copies OK.
The difference is that we run the “extra copies” directly from the computer files (in fact, they are “masters”, not “copies”).
At home, you will indeed make “copies”, using the CD as a master.
Any imperfections caused by the copying process will be present in your CD copies.
Additionally, we “slow burn” the audio CD’s and use equipment optimized for producing audio CD’s (for maximum compatibility and quality).