Some body please tell me if the following expression regular or not?

Q1. {a^n b^m | n + m >= 100}

Q2. {a^n b ^ (m+n) | n, m >= 0}

Confusing some finite values possible but Non-regular, because powers can be infinite; if n==0, m >= 100; if n==1, m>=99; if n==2, m>=98 and so on.

Is there any difference between (1) & (2) or both same?

Zulfi.