The difference between All the same and If it's all the same
All the same is also adverb with the meaning: anyway.
If it's all the same is also phrase with the meaning: if it makes no difference.
check bellow for the other definitions of All the same and If it's all the same
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All the same as an adverb (idiomatic):
Anyway; nevertheless; nonetheless.
Examples:
"He knew it was risky. He did it all the same."