I just bgt. a 4-pack of Grand Slam calls from MAD {Lohman}. One mouth call each for the 4 main species..Eastern, Rio, etc. Are their really that much a difference in vocalizations between the species that warrant a different sounding call for each, and would I be really able to notice the subtle differences? Would the turkeys know a difference based on an individuals different style of calling and tone? Are the birds that smart? Can I just use any call in the pack, or only use the Eastern?