Does it matter how much is in your investment accounts?

Hey everyone - I saw Jeremy post about this a while back on IG about it not mattering how much is in a specific account when it comes to growth of the investments. Is this true?!

Example: my 401k with 100k in it vs. my Roth IRA with 10k in it. Isn’t it always better to put it into the 401k for better growth with the larger amount of money?

The explanation was solid but I’m having a hard time wrapping my mind around it! Haha thanks!