Schots have heritage style pencil tiles in black, dark green and burgundy https://www.schots.com.au/tiles-parquetry/ceramic-tiles.html#q=&idx=schots_production_default_products&p=0&hFR[categories.level0][0]=Tiles%20%26%20Parquetry%20%2F%2F%2F%20Ceramic%20Tiles%20%2F%2F%2F%20Bullnose%20%26%20Pencil%20Borders&nR[visibility_catalog][=][0]=1&is_v=1. Blue might be tricker to find.

Have you already sourced your tiles? I would expect most tile stores could help you find the edging tiles which I think are typically termed 'pencil' tiles for the style you have shown. We used bevelled subway tiles in our DIY ensuite. In hindsight we would have aimed to finish the brick pattern with 1/3 and 2/3 sized tiles (like in your pic 1) rather than full and 1/2 (pic2 and 3) to give a more even edge thickness/profile... Might not suit and we didn't use capping tile (I lost that arguement!) so it is probably more obvious in our bathroom, but just something you might like to consider.

Love those! I think you've found it! Otherwise if you're after a more encaustic tile finish (more matte, stone look which I love) you can find them. If you're in Melbourne, Schots have one called Versus, but there's lots of brands that do them if you search encaustic diamond tiles?!

Sarah Sarah is right. You won't find a perfect match unless you find new old stock for sale on ebay or gumtree - but you have to be lottery lucky. Try moving tiles from under the fridge, or under the dishwasher, or under the bottom shelf of the pantry. However you will probably break about half of them in the removal process. Don't even bother to try and trim different tiles like annb1997 has suggested as there are too many variables with thickness, finish, texture, colour and gloss level. A mismatched tile will be obvious every time you walk into the kitchen and be a permanent annoyance. Best of luck, Dr Retro of Dr Retro House Calls