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At last, I´ve been to then Jeep dealer and:
52128879ab: Front Right spring. Prize 74,41 €
52128878ab: Front Left spring. Prize 74,61 €
So, if Right spring is cheaper than Left spring, I think that Left (driver side) is stronger than rigth (perhaps because of the battery or steering column, ...)
Then, the codes:
[ZCH,ZRH] references Front Left springs
and
[ZCJ,ZRJ] references Front Right springs
Thanks.