Can anybody speak with confidence about the ending letters in a Manufacturer Part Number (MPN?)

The instrument cluster seems to have half way died in an old Jeep. I can find eBay listings for old instrument clusters for the same make and model. The pictures look the same as mine but there are differences in the MPNs listed and what my dead cluster has.

eBay examples:

  • 56009727AC
  • 56009727AD
  • 56009727L

Current borked cluster: 56009727J

Would these all be interchangeable? Does the letter mean anything important when it comes to finding a replacement?