Need ideas on how to manage upgrade to legacy proc, func ...etc

We have legacy procedure, function and packages. Ex: JOURNAL_DETAIL(), a journalization procedure.
All our applications make direct calls to this object (thru DLL sometimes). We implemented a new version of JOURNAL_DETAIL, with the same signature, but the code inside depends on a new package. Bug, some application cannot be updraded to the new package at the same time, so we decide to have two function:
JOURNAL_DETAIL -- the old ond
JOURNAL_DETAIL_XXX -- the new one
But then the other application would have to be changed to use JOURNAL_DETAIL_XXX(), so we decided we dont like this.
So we decided to provice a unique JOURNAL_DETAIL() which will decide if the old code should be called or the new one, depending is the new package is installed and initialized. But since we dont want to duplicate code in one humongous proc, we decided to provide:
JOURNAL_DETAIL -- now a dispatcher to
JOURNAL_DETAILI_LEGACY
JOURNAL_DETAIL_NEW_APPL
But eventually we wiil end up having several version of the same function in our schema, winch we are not sure its a good idea. With DLL, the problem is simple, keep the same interface, but change the code in the DLL. We would like to know if there is a way to do this in Oracle.
Maybe using packages ?
Thanks.

What do DLLs have to do with what you are doing in an unstated (3 decimal places) version of Oracle?
You have provided almost no information that can be used to generate a response beyond just a wild guess.
Assuming DLL refers to a Windows-only Windows-centric design I would urge you to move your code inside the database into packages.

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