Part Number: LM2903
Other Parts Discussed in Thread: LM339
Dear Expert:
LM2903D 20250811 Right picture
LM2903D 20250528 Left picture
The internal architecture of X-RAY chips is different

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Hello Herbert,
The LM2903 is under multiple PCN's.
Please see the LM339 family appnote, section 3:
Application Design Guidelines for LM339, LM393, TL331 Family Comparators
The "square" die is the latest die. The leadframe is consistent with the current design.
I do not see any issue.