adding own created custom block to an existing datapack

Hello, 
i struggle at the moment with the following. I use a datapack created by Admin4cc which creates different machines which can perform actions which is awesome. i have a small server for me and some friends and now i decided to add some own stuff to that datapack to make it a bit custom. So i followed a tutorial of him on how to create a custom block, which works fine, but now i want to add that block to his datapack to be able use it in his machines.
my question is, how can i replace e.g. cobblestone with a custom block i made
execute positioned ~ ~1 ~ if block ~ ~ ~ #wasd.machine:crushable run block{
    execute if score stone wasd.crusher matches 1 if block ~ ~ ~ stone run function wasd.machine_crusher:block
    execute if score cobblestone wasd.crusher matches 1 if block ~ ~ ~ cobblestone run function wasd.machine_crusher:block

can i use the namespace? if yes in which order i have to set it.  my customblock is in an own datapack