Upgrading from mame 193 unmerged to 250 merged possible while keeping old settings?

[Hamburglin]

I put a ton of work in an UNmerged 193 romset in launchbox. I edited a ton of their default app versions to 4 player and English versions. I also changed a lot of dipswitch and system settings for a bunch of games.

I now have the latest 250 romset that is MERGED and want to start using those.

I don't want to lose my original launchbox settings or mame rom settings. Is there a way forward for me here? I'm open to regex find and replace or simple scripts if it's possible to do.

For safety's sake and to and to see what the LB xml would look like, I was thinking of importing the 250 romset as a completely different platform to allow to not affect my 193 set. Is this possible too?