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LM43603-Q1: Could you tell me the difference between LM43603-Q1 and LM43603A-Q1

Guru 29690 points
Part Number: LM43603-Q1
Other Parts Discussed in Thread: LM43603

Hi Team,

The datasheet shows the following.
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LM43603A-Q1 version is optimized for PFM operation and recommended for new design. The device is pinto-pin compatible with LM4360x and LM4600x family
https://www.tij.co.jp/jp/lit/ds/symlink/lm43603-q1.pdf?ts=1619170774874&ref_url=https%253A%252F%252Fwww.tij.co.jp%252Fproduct%252Fjp%252FLM43603-Q1
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What does "optimized for PFM" mean?
Could you tell me the difference between LM43603-Q1 and LM43603A-Q1?

The background of the question is my customer has delivery trouble for LM43603 so he wants to judge if LM43603 can be replaced with LM43603A-Q1.
Is it possible?

Best Regards,
Yaita