I am not a huge expert on this. I am pretty sure that Bull snakes are classified as a type of gopher snake now. But there are a lot of differences in color patterns and so on. Of all the snakes that I know of Bull/Pine/Gopher snakes seem to have a lot more localities attached to a name. Like "Christmas Mountain Bullsnake" or "San Diego Gopher snake". And the different localities have different patterns and colors. I think some may get larger or smaller etc. Someone else on these forums could probably answer it better than I can.