It does seem that you can get quite a range from the same heritage.
One set of great grandparents has yielded a lot of connections but, as yet, no confirmed ones from the only son of my GGM's second marriage.
3C 26.8 cM
3C1R 14 to 95 cM (8 confirmed)
3C2R 13 to 35 cM (4 confirmed)