2 Appraisals 20,000 difference

[Christian Smith]

Hello I was attempting to refinance my home and received a FHA appraisal less than 30 days ago. Decided to do a conventional loan instead so a new appraisal was ordered and came in 20,000 less than the first one. There are some inaccuracies including the 1st comp used last sale amount wasn't used and that was a difference of 74000 in sale price. The 2nd comp used was for a house that was in probate and was sold under market value for its characteristics. What is the best and fastest way for me to get this handled and hopefully a reconsideration of value. I appreciate any advice. Thank you!