EOLed EPM240T100C5N - replacements with suffixes like RR, AD, AH, AC or AA

Intel originally issued a PDN to EOL the MAXII series, but got enough pushback afterwards from some key customers, such that Intel issued a revised PDN that removed MAXII from the current EOL list. They indicated its status would be reviewed sometime again in 2024.

So your vendor may be going off the original PDN and have not have updated to the revised PDN.

The AD, AH, RR, AA, AC suffixes are not standard. Where do you see these part numbers?

I have seen this done before where the part is preprogrammed from the vendor, and they make it orderable by a unique suffix.

So in that case you could buy the preprogrammed part and just reprogram it with your image.