Both of these are common for all users on the computer, so unless you did something really creative, Applications and system folders are shared between the two accounts. If one of the users has his/her own private Applications folder (I have), you just move the applications (drag-and-drop) into the global Applications folder and all users will have all applications.
Your challege will be user data configuration of the applications. Outlook app should be in global Applications folder, but your user profile = name, e-mails, and attachments will be in user specific folders.
I am still confused on what the problem is. I assume one of your accounts has your current e-mail and configured applications. The other does not but has something else you want to retain. So use that one account which has up to date stuff and copy stuff from te other account on a separate drive and move any data (if there are any) into that most up to date account. Or are you looking for merging the stuff together? That can be very difficult.
Thank you for your help!
I kept as the account to be used as the current one, the one which showed to have more data, copied some files from the other one and put a few big ones in an external data drive.
The mails updated by themselves quickly so I was again uptodate regarding mails.
My applications seem to be, as you said, common AFAIK and the Mojave System Settings, the thing I feared most, seem to be working OK regardless of the home account I now use.
Some files ask for permission but that is logical and easy to grant.
Hoping no new unexpected difficulties appear, I believe my problem to be solved.
I thank you very much, Honza1, for your kind assistance!
One Problem, not related with my 2 accounts, still bothers me.
I cannot take full possesion from the Mojave side, of my Bootcamp Partition in spite of having installed Tuxera NTFS. I can open and see the folders but cannot copy anything into or from that partition.
If you know a way (using the Terminal for instance) to become a full fledge owner with full rights of the BootCamp Partition please let me know it.
However I am aware it has nothing to do with the problem which made me start this thread.
Again thank you very much Honza1 and a happy 2020!
Ed