Just bought new GTIN, but it’s doesn’t include my company prefix

When I started out, I bought my company prefix, which came with 10 GTIN barcodes. I’ve reached the point where I have more products, so I need to purchase more GTINs.

When I went to GS1 and placed the order, I guess I kind of assumed it would just add on to my existing prefix, since I was logged in and everything. Of course, it didn’t and so now I just have one random GTIN that doesn’t match the rest.

Is there a way to change this GTIN to match the rest? Does it not really matter if it matches, should I just use it as is? How do I purchase a GTIN to match my company prefix in the future?