Should not be a major problem. The only one you really have to worry about is the SH2 (Supersweet). Unless isolated they can give very unsatisfactory results. Of course if you have whites and yellows interplanted you get bi-colors. Both Sunglo and Sugar Buns are yellow, so won't be a noticable difference.

Thanks or the info FD!

I might as well make use of this thread for another
corn pollination conflict I'm wondering about:
do the triple sweets require isolation from
other corn varieties or not?
For example, Serendipity. According to Park Seed
at this site, no isolation is required:

http://www.parkseed.com/webapp/wcs/stores/servlet/StoreCatalogDisplay?storeId=10101&catalogId=10101&langId=-1&mainPage=prod2working&ItemId=5529&PrevMainPage=advsearchresults&scChannel=Vegetables%20AS&SearchText=p16.v231;s1.Corn&OfferCode=TH1

But according to Territorial Seed at this site, the same
isolation as SH2 is required:

http://www.territorial-seed.com/stores/1/Serendipity_P550C68.cfm

Who's right and who's wrong?

I don't know from experience. Most sites state that it doesn't need isolation. The only one that I have grown is Avalon. No noticable detrimental effects although I did not like Avalon as much as Silver Queen.