Bricks come in and out of fashion as do brick kilns/manu's. Your only hope is to find a willing and competent builders yard bod who is experienced enough to know what is out there and available. Always tone down not up and it's as important to match the mortar as it is the brick.
Buildbase matched some for me recently against a brick that I took to them (it's easy enough to get one out if you don't have a spare). I only wanted 40 bricks but they made an effort to match them even though they didn't have any to sell me.
It was then a search of other builders merchants until I found one with a stock of the bricks that Buildbase recommended. The match is not perfect but is good enough to blend in.
Even if you could find the exact same brick it will not be an exact match as each batch varies in colour slightly.
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