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Why the contradictions b/w Bhagavata Gita and Bhagavatam?

I was comparing chapter 10 of Bhagavata Gita and Canto 11 chapter 16 of Bhagavatam. The two states similar opulences. However I found a few contradictions as well. Consider the below:

BG 10.29 states- "In weapons, I am Vajra"
BG 10.31 states- "Among the wielders of weapons, I am Rama"
SB 11.16.20 states- "In weaons, I am bow. Among the wielders of weapons, I am Siva"

So you can find there are contradictions between the two. Why are the contradictions there given both the spoken by the same person, i.e. Lord Krishna?

Jai Sri Krishna.
Ratnadeep.