XSPC Res top for mcp-350/55 pumps Fill port thread size?

Ok looking up fittings under xspc they show an adapter for (I believe it was) M20 to G1/4. BP has adapters for G3/8 to G1/4 is that the same?

All the other fittings are BP matte black so it would be nice to use BP for the fill port adapter to go up to an external BP fill port in the top of my case.

I'm referencing the large black plastic cap with the + on the res top threads.

Anyone know?

G3/8 to G1/4 it is not the same the one in the res is Metric and 20mm vide and the one you listed is is fo very small ca. 10mm to g1/4