Hi Vlado,
From your description, it looks like your question is around comparing the properties of tables to determine if they are two consecutive table that should be considered one table or if they are different tables and therefore have two final rows. Is this correct?
I have discovered that some parameters do not exist, I am unsure how to all compare them.
Since properties by definition are defined to be differences from the default formatting for whatever object, in this case a table, if some properties are missing (you had said "parameters"?) then they would be assumed to be the default values. Therefore, you comparing all properties would be possible.
Is it necessary to compare all these parameters (if exist)?
Yes.
I sometimes encounter difficulties when the table row contains merged cells, etc. ...
For the rest of your question about merged cells, I'm not clear what the problem is here. Can you be more specific about what is wrong with the table rows you are describing there? If you can provide a sample document with that table, it might help also.
Best regards,
Tom Jebo
Microsoft Open Specifications Support