Consider two loans of $$100,000,$ both with fixed monthly payments.

$1.$ APR $=6\%,30$ years, full amortization.

$2.$ APR $=6\%,30$ years, only $$50,000$ is amortized. $($This means that after $30$ years, the borrower has paid down $$50,000$ and the remaining balance is $$50,000.)$

What is the difference in the monthly payment amounts? i$.$e$.,$ Payment$1$ minus Payment$2?$