It's only the major build version (Matrix v19.x vs Leia v18.x vs Krypton v17.x etc) that matter. The minor ones (the bit after the point) doesn't matter.
The database version is only bumped when the major version is. The minor ones within a given major release version all use the same database number.
Look in the debug logs of each instance and check that the advancedsettings.xml file is being read correctly, and whether there are any other access errors shown.