The difference in pin configuration between the original 7-pin board and the replacement 6-pin board is likely due to manufacturer variations or model differences. It's important to verify with the manufacturer or supplier whether the 6-pin board is compatible with your specific fireplace model. Since the replacement board you received does not fit, the best course of action is to contact the manufacturer for clarification on the correct part number and compatibility. If the 7-pin board is required and not currently available, request a return and refund from your retailer. Be sure to provide your fireplace model and details about the connections when seeking assistance. At Elkhart RV Parts, we strive to keep product images and descriptions accurate and will update listings to prevent this confusion. If you need further help finding the correct part, feel free to reach out to our customer service team.