What's the difference between 'sona ni' and 'soko made' ?
Are they interchangeable ?
Konnichi wa minasan !As the title says , i'm having a hard time figuring out the nuance between 'sona ni' and 'soko made'.From what i understand , they both have the meaning of 'so much'.Is this correct ?Kansha shimasu :)

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They are interchangeable, but to me, そこまで is stronger than そんなに. I would translate "そんなに"  into English as "so much" or "like that", and "そこまで" would be "go that far".

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I think your understanding is correct. In many cases they are interchangeable.  But they are not completely the same. And both そんなに and そこまで usually follow negative meaning.