Thanks for the compliment on the home. To answer your
question, yes the paint color for the brick is an exact match to the Hardie
color Monterey Taupe and paint is from Sherwin Williams. All of the James
Hardie colors are available in paint (exact color match to Hardie) and should
all be in Sherwin Williams's inventory, you can call your local store to verify
this and they're very helpful.

Sherwin Williams do color matches for every color, but Hardie
colors have already been made to match in paint and should be available at
their stores due to demand (sorry if I'm being repetitive, just want to help).
Also, would like to add that due to sunlight, colors of houses may look
like they differ, but when you're in front of the house, it matches
perfectly. Thanks again for the comment!

I contacted Sherwin Williams and the manager at my local store told me I'd have to bring in a sample of the board and that they have nothing on file for the exact match. I then called JHardie and they said "It's a baked on color and there's no named paint color you can buy to match it." They are sending me a sample piece of board, however so I can take it to my Sherwin Williams store.