Are 32-bit RPMs compatible with 64-bit RHEL OS?

I'm starting to upgrade the rpms on our test RHEL servers, which one of them is a RHEL v5.11 64-bit.

I'm noticing a number of the rpms getting upgraded are 32-bit.

Will this matter or are the 32-bit compatible with 64-bit RHEL OS, or could there be a problem in the future? I looked around online first before asking and couldn't find a solid answer.

thanks