Conditional Format the first x matching results?

This is stumping me a bit.

A coworker asked me if it was possible to apply conditional formatting to her workbook. She does not want to add any formula/reference columns or rows.

Column A: a list of part numbers
Column B: quantity of those part numbers in stock (this is x)

Columns C-T (possibly more) list of part numbers required for a build

What she is asking is for conditional formatting to look through the C-T range and to highlight the first x amount of parts, referencing Column A for the part number and Column B for the number of items to highlight.

So if cell A1 = 12345 and cell B1 = 5, it would look through Columns C-T and only highlight the first 5 instances of "12345".

Is this even possible with conditional formatting or would this be more of a VBA thing?

Post a small Excel sheet (not a picture) showing realistic & representative sample data WITHOUT confidential information (10-20 rows, not thousands...) and some manually calculated results. For a new thread (1st post), scroll to Manage Attachments, otherwise scroll down to GO ADVANCED, click, and then scroll down to MANAGE ATTACHMENTS and click again. Now follow the instructions at the top of that screen.