4 row aluminum tube radiators DO NOT exist. What some aluminum radiator companies do is market a 2 row 1" tube rad as a 4 row. Most all aluminum rads start at 2 row of 1" tube and you can larger tubes inside from there like 1.25" or 1.50". I have even seen 3 rows of 1" tube which Fluidyne used to make but never anything like a 4 row.
What they do is compare a 2 row alum. to a 4 row copper. Most all copper/brass rads are 2-3-or 4 rows of 3/8" tubes. So 1 row of aluminum tube is actually wider than 2 rows of copper. So 1" will flow much better then 2 rows of 3/8"
So anytime you see an ad for 4 row aluminum rad, you know it will be 2 rows of 1" tube. Which BTW are are a very good radiator so if it's a good price, get it.