That depends on the custom panel. The core of the OGLML code it generates will be the same but certain functions, tags, or features may not be available in an older version.
We work very hard to maintain forwards-compatibility (a panel created in DashBoard 6.0 MUST work on DashBoard 8.3) but, given that DashBoard is free and publicly-available, we generally expect people to upgrade to the most-recent version to get access to the many new features and improvements we put into each edition.
Is there a reason why you want to stay with an older version on some systems?
James
#DashBoard