RIFA film capacitors , difference between two capacitors

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Joined Aug 3, 2021
hi! I have two RIFA film capacitors which has this information on one side of them " PHE841 E 330V X1 40/100/56/B" and on the top of one of them has been written "100nMBBN" and the other "100nMBJ1" . what is the difference between them? what does J1 mean? I couldn't find it in data sheet.