Merge of megan namelist item from CAM and CTSM is failing even though there are only whitespace differences

I have a case that's failing in the merge of the CAM and CTSM namelist for drv_flds_in in preview_namaelists even though the difference is only in whitespace. It's comparing a character array of strings. It's not recognizing that whitespace differences in the list of strings is valid in FORTRAN. This is in cmeps1_0_20 the latest version right now...

Here is the error I'm getting:

```
Create namelist for component sesp
Calling /glade/derecho/scratch/erik/cam6_4_032/cime/CIME/non_py/src/components/stub_comps_nuopc/sesp/cime_config/buildnml
2024-10-01 16:01:49 cpl
Create namelist for component drv
Calling /glade/derecho/scratch/erik/cam6_4_032/components/cmeps/cime_config/buildnml
Writing nuopc_runconfig for components ['CPL', 'ATM', 'LND', 'ICE', 'OCN', 'ROF']
Key: megan_specifier,
Value 1: 'CH2O = formaldehyde', 'CO = carbon_monoxide',
Value 2: 'CH2O = formaldehyde','CO = carbon_monoxide'
ERROR: incompatible settings in drv_flds_in from
/glade/derecho/scratch/erik/cam6_4_032/cime/scripts/SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s_waccm_ma_mam4.20241001_150352_n6ytq4/Buildconf/camconf/drv_flds_in
and
/glade/derecho/scratch/erik/cam6_4_032/cime/scripts/SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s_waccm_ma_mam4.20241001_150352_n6ytq4/Buildconf/clmconf/drv_flds_in
```

How to replicate this case:

- Check out cesm3_0_alpha03d
- cd ./cime/scripts
- ./create_test SMS_D_Ln9.f19_f19_mg17.FWma2000climo.derecho_intel.cam-outfrq9s_waccm_ma_mam4 -r . --walltime 00:20:00 --no-build
- cd
- ./xmlchange LND_SETS_DUST_EMIS_DRV_FLDS=FALSE
- ./preview_namelists