Upgrading James, how to merge maildirs

Hello,  I am a small SOHO/Home operator of a James server, running it on 
OpenSuSE 15.2 and am in the midst of trying to upgrade it from a 
snapshot version of 3.4 to 3.6, but before jumping that far, I 
downloaded and installed the released version of 3.4 thinking that 
upgrading from the snapshot version to 3.4 released version would be the 
safest first step. It hasn't gone well and I have been jumping back and 
forth between these two versions while discovering and fixing problems 
as they show up. (Mostly things like missing jar files or wrong versions 
of them, and miss-configurations)  Anywise I am now noticing a 
divergence in the maildir databases, new folders added, emails in one 
version but not in the other etc.

So I am wondering if there is a tool or some other means to do a merge 
by hand. I tried/attempted some obvious things such as simply copying 
maildir folders across from one database to the other and updating the 
subscription lists but that alone didn't work. So I could use some 
guidance and/or pointers to documentation that describes how James 
models, uses, and makes changes to it's maildir database. The James 
website does not provide much in the way of documentation nor has Google 
been helpful.

Thanks in advance for taking the time to help me with this issue and/or 
provide advice.    Marc


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