Hi Ron Brown,
If my memory serves me right, the company that made my original 2007 macerator changed ownership a few years later. It is conceivable that the macerator part number could have changed without changing the macerator itself, so I would not worry about mismatched part numbers.
If your macerator looks like my original and replacement, then I would try what I did. If yours looks different, then I advise to look on websites like eBay for a similar one like I did for mine.
Don't be fooled by the 3" fitting of your macerator. That connection is a separate piece. Here are 3 pictures of pumps that look different, but are of the same core design. Just swap out the peripheral parts.


