That product looks fine, but you'll need one of these..............
https://www.screwfix.com/p/no-nonsense-sealant-gun/988hp
Holes in brick are always problematic because of the colour.
You can definitely use the same product for the brick holes though.
Colour matching is always trial and error. My favourite for filling old drilled holes is to grind up a bit of the same brick and mix it with PVA adhesive, and stuff that in.
I you use the one in the tube, you could always tickle it with a felt tip pen or similar afterwards to get some kind of match.
You wouldn't believe the potions that are made up and used to match colours, especially in trying to match roof tiles ;o)