It is possible, although the matches are not really that close. A lot depends on how common the surnames and haplotypes are. It is extremely difficult to find a paper trail for different surnames. I would not bother much with such matches until you are pretty certain there was a non-paternal event (NPE).
The next step is to test documented descendents of other sons of your ggg-grandfatherto triangulate the ancestral haplotype. If it is closer to the mode (most common value at each marker) of the three, there might be some possibility.
Even better would be to test a cousin descended from an ancestor who lived before him. If the two cousins do not match closely, there would be an NPE in one line.
A lot depends on the markers where they differ. I would just look at the markers other than CDY, DYS576 and DYS570. If he is in R1b1a2 haplogroup, it is very likely that it is just a random match, since so many haplotypes in it are very close.
At this point, the only paper research I would do is search your surname boards with the matches' surname (and vice versa) to see if any one has run across a possible NPE.