Does the 38mm watch band fit the 42mm iwatch?

You're welcome! 🙂

That is correct.

As advised in my previous reply, a 38mm band is not designed to fit a 42mm Apple Watch. Nor is a 42mm band designed to fit a 38mm Apple Watch.

Hi

No - all Apple Watch bands are designed for use with all Apple Watch models of the same case size (38mm / 42mm):

Buy Apple Watch Bands - Apple

42mm watch use 42mm bands only

38mm watch use 38mm bands only