As I know both are used for implimenting Strurs validation module.
If you extende your formBean to DynaValidationForm you can use form name in validation.xml If you you extende your formBean to DynaValidationAction form then you can use action path in your validation.xml file.This will be useful if you are using the same form bean for multiple actions and you want to validatate some of the attributes in each action.
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subject: what is difference between DynaValidatorForm and DynaValidatorActionForm