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LM5050-2: LM5050MK-2 Top marking "SZJB", but the "S" on chip surface is different as before.

Part Number: LM5050-2

The first letter "S" of top marking in Picture 1 and Picture 2 are different.

Are these 2 types of "S" normal?  Any document to prove this change?

Anyone can help to advise the difference??   Thank  you for your quick reply.

Date Code: 1743.    Picture 1:

Date code: 2101+5.     Picture 2: