You should not have had to change your password unless you’d forgotten the old one.
They can be different or they can be the same. It’s up to the way you set up your accounts.
New version of what?
What do you mean differently?
It’s not a good idea to copy and paste from Excel to LayOut. It’s better to Insert the xlsx file into LayOut using File>Insert and then select the range of cells you’re interested in. Copying creates a reference in a temporary directory which will be deleted when the OS does maintenance. Losing the reference file is obviously not helpful.