1/2" Flat Face Quick Connect Question

[Oldtoad]

Got a Frost Bite Log Grapple, came with 2 male 1/2" couplers. Need one female.
The threads on the hose are 1/2" FPT, the new coupler is 1/2" NPT about 0.030" difference by my calipers.
Anyone know about this?

 

[Oldtoad]

One is 1/2" BSPP, the other is 1/2" NPT.
Both ISO 16028 standard, just different threads
Close but no cigar...