If you can get them open, smell them, and see which is more in line with the desired flavor. Either one will get you the bittering IBUs, though you will have to adjust the quantities, but the overall flavor will come from the later addition. Honestly, I think it may be a late addition Cluster (just based off what's in my fridge now), but not really sure.
Gypsy Head Brewing Company
"I promise never to drink any more... but just as much." - Buster Keaton