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The latest RHEL-7 build is perl-Time-HiRes-4:1.9725-3.el7.

The latest RHEL-8 builds are:
 * perl-Time-HiRes-0:1.9758-1.el8 (nonmodular)
 * perl-Time-HiRes-0:1.9753-2.module+el8.1.0+2926+ce7246ad (perl:5.24 module)
 * perl-Time-HiRes-0:1.9760-439.module+el8.3.0+6718+7f269185 (perl:5.30 module)

It seems that perl-Time-HiRes lost an epoch number and that makes a NEVR string of the packages lower and prevents from an in-place upgrade. It's desired to introduce the Epoch=4 to the RHEL-8 packages.

The issue is mostly irrelevant for modular packages from the non-default streams because streams are incomparable and users are advised to switch the streams with "yum distro-sync --allowerasing" command.
That leaves the fix to the non-modular perl-Time-HiRes-0:1.9758-1.el8 package. We can correct the modular packages any time later.

For the records for the historians: We had the same issue in RHEL-7 as RHEL-6 bumped the epoch by a mistake. See bug #1029470.

I would left modular packages out as E:NVRA is completely irrelevant when switching streams. Actually, I've seen Epoch being removed from a modular package for it's loss of purpose there.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (perl-Time-HiRes bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1822