If they are 2.5" wide up front, then they are not the original.
The later CJ springs ARE stamped with numbers that indicate soft/standard/Heavy Duty in soft and hardtop/4 and 6 cyl engines CJ-7/and Scrambler.....so yes, a lot of combinations.
The springs from the late 70s/early 80s are numbered as well, but I don't know how to decode those.
The OEM springs are stamped into the metal of the smallest leaf next to the center pin.
Aftermarket springs usually have painted numbers on the topside of the longest or main leaf.
If you post a picture of the spring pack binder, I can tell you a good probability if its OEM or not.
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon