For the past several releases Oracle has provided paired offerings for JRE 8, the latest being JRE 8u73 and JRE 8u74.
I cannot find any significant difference between the two and have been installing the higher numbered version. (There is also no recommendation that one should install both, one after the other.)
I have no idea if there is a functional difference; certainly nothing seems to jump out at me.
Anybody got a notion?