LM2903B-Q1: Difference between LM2903BQDGKRQ1 and LM2903BQDGKRQ1

Tool/software:

Hello, Team,

We have two questions related to OPN of LM2903B-Q1:

1. What is the difference between LM2903BQDGKRQ1 and LM2903BQDGKRQ1? From the datasheet, we could not see any difference between them other than whether it has "H" in the OPN.
2. If there is a difference, what is recommended for new projects?

Best,
Masaru