Is flashing from a new rom to an older version bad?

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Sorry if this question has been asked before. I did a search but could not find anything so it may be a matter of how I worded my search. I am currently running Cyanogen 4.2.5. I upgraded to CM4.2.7, but decided to go back to CM4.2.5 so that I could continue to use a theme that I really liked. So my question is, is it bad to go backwards with roms? I have found a theme that I really want to try, but it was created for a much older Cyanogen rom. It was actually created for CM4.0.4. Is this considered a bad thing with the G1? Mods feel free to move this thread if the Q&A section is the wrong place.

My specs
G1/Dream
CM4.2.5
NabzHero theme
Haykuro's Danger SPL
DRC83 build

Moving backwards as far as ROM's go isn't harmful if that's what you mean by "is it bad".

If the theme hasn't been updated since 4.0.4 it will not be compatible. The build has changed from the ground up since then.

Thanks for the quick reply. Let me make sure I understand you correctly. If the theme I found was made for Cyanogen 4.0.4 and I flash the Cyanogen 4.0.4 Rom it still wont work because the build is different? By build do you mean the fact that I'm on DRC83 is the reason it wont work?

Thanks

Contact the maker of the theme and ask them to remake it as a Metamorph theme. Then it should be good forever.

I liked NabzHero too, but updates were kinda non existent. Enoch is similar, updates with in hours of the new CM version and is available via the CM updater.

Wish Enoch would change the tab for the drawer though...I don't like the way it looks.
Off to pm Enoch...

Simple answer: No, it's not harmful, bad, or wrong to go back and use an older version of a ROM. But, if you're using an old ROM, don't be surprised if something you find here that says it works on Cyanogen won't work--it may be intended only for the latest version.

The build is fundamentally different since 4.0.4, but you can still go back and use it. But, you may have to do a wipe from recovery before you flash it. Just try flashing 4.0.4 over 4.2.7.1, and if you get errors, reboot recovery, do a full wipe, and flash 4.0.4 again.