Jelco St-250/Audioquest PT6 the exact same?

I have been googling around and have not been able to confirm that these are an exact match. I am getting a Jelco for my HW-19 mkiv and have to fab an armboard and mount the Jelco. I have found better templates for the audioquest and comparing them to the jelco instructions they seem identical but wanted to be very certain before drilling any holes.

thanks