WM1302 SPI US915 FCC ID # difference?

Good afternoon…
Your site has available for purchase WM1302 as SPI US915 in two locations:
First location is $88.90 FCC Z4T-WM1302-A
Second location is $83.90 FCC Z4T-WM-1302-C

  1. What is the difference ??(odd that the -C later version is cheaper)
  2. Is there a guarantee that if I order -C I don’t receive -A and vice versa?