Find a duplicate value in a specific location in a Data Table

[Al Del]

I have a Data Table, at times there will be duplicate values. I want to conditionally format a specific value defined by the horizontal and vertical heading values. Example

	1	2	3	4	5
20	31	32	33	34	35
21	42	4344	43	44	45
22	51	52	4344	54	55
23	61	62	63	4344	65
24	71	72	73	74	75

<tbody>
</tbody>

I enter the horizontal and vertical coordinates.
Horizontal row heading value = 22 (cell O51)
Vertical column heading value = 3 (cell O52)

Using a formula similar to this I find the value at that coordinate.
=INDEX($H$57:R$84, MATCH(O51, $G$57:$G$84, 1), MATCH(O52, $H$56:$R$56, 1))

My problem is I want to conditionally format the cell with a border and color, but if I have duplicate values all three values, 4344, are formatted. In this example I want to only format the cell at the intersection of row 22 and column 3.

 

[Andrew Poulsom]

Conditional Formatting formula applied to H57:L61:

=(INDEX($G$57:$G$61,ROW(H57)-ROW(H$56))=$O$51)*(INDEX($H$56:$L$56,COLUMN(H57)-COLUMN($G57))=$O$52)

 

[Al Del]

Thanks Andrew, works great. I had another question relating to the same data table, but I will create a separate post for that.