Generally speaking, no. Some of the class names may have changed between 8.2 and 9, therfore you need to update those references. Also, 9r1 introduces template rules. So for instance, in 9r1 there will be the default/base Requisition rules with template rules. You can ignore them and just use your updated 8.2 rules, or modify your 8.2 rule set to also have the template rules available for future development.
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