I assume that your other son tested at SMGF.org and not one of the commercial firms that also used Sorenson.

If he is 1 higher than his father on Y-GATA-H4, but matches him on DYS442, he may not have the latest SMGF.org nomenclature. The most obvious difference is that DYS452 will be around 11, whereas it should be around 30.

You can check by searching the database with his results to see if he matches himself. Choose NIST or Ancestry.com as the lab and do a surname search. To convert to FTDNA, simply switch the lab to FTDNA.

Let me know of any marker mismatches and I will post the corrections.

It is also a good idea to save the search.