Conditional Highlighting Rule Help

I have a table showing aging invoices - some which have been partially paid and others which have not been paid at all. I have been trying to use "Conditional Formatting - Duplicate Values", to quickly identify which invoices have been partially paid vs invoices without any payment applied. But using the "Conditional Formatting - Duplicate Values" just highlights every instance within the entire table that has a duplicate value somewhere else in the table. I ONLY want to highlight rows for which the invoiced "Amount" is the same as the "Open Balance" for that invoice.

Attached is worksheet with: 1. a sample of the table with NO conditional formatting applied, 2. a sample table showing the end result I'm trying to accomplish, and 3. a sample table with my wrong "Conditional Formatting - Duplicate Values" rule

Thanks in advance!