So do you know what the difference between the two terms is? Because it doesn't look to me like you do.
I'll save those of you who don't know the answer the trouble of looking it up. Those terms were used in AO-6 to delineate between what an appraiser does vs what a user does. AO-6 has already been retired, so that's why most of the noobs (which isn't everyone here) wouldn't be familiar with it.
When an appraiser reviews an appraisal the subject of their review is the appraisal itself, the opinion being developed is about the quality of that work, and the decision to be made is limited to what to do with the appraisal report.
When a user "reviews" an appraisal the subject of their review is the property being appraised, the opinion being developed is whether or not they agree with the results, and the decision to be made is oriented towards what to do with the property.
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So a licensee who is acting as an appraiser is doing something very different from a licensee who is acting like a user. If I'm a licensee but I'm working at the moment as a loan originator or an underwriter then those roles are as users, not as an appraiser - regardless of the fact that I also hold a license.
There is no such thing as a USPAP compliant buyer or a USPAP compliant brokerage service or a USPAP compliant loan decision. These activities and all appraisal scrutiny these individuals are performing lie entirely outside the realm of appraisal practice.
OTOH, if I am working as an appraiser and reviewing someone else's work and my opinions are about the quality of the appraisal then those actions fit the definitions and USPAP is applicable. The fact that the service may be deemed outside of a state's jurisdiction or the like is a licensing issue, not an appraisal standards issue.