Wow, amazing! I have a Bleecker large flap that has heavy scratches on the (antiqued) brass buckle. I wonder if this would help.
I have the scarlet. It's a darker red. Coach made two reds for vintage and 90s bags, and scarlet is a close match for the darker one. Your two darker bags look a little closer to burgundy. Maybe those are autumn red? Scarlet might match your Carly and possibly the Prairie. The red looks like it might be close to Coach's brighter red. Sometimes you have to mix. None of your bags look like they need much help.
I've only once used Leather Refinisher on an entire bag. The bag was covered with ink and was unusable the way it was, so I had nothing to lose. It is difficult to get it even but not as difficult as Fiebings dye. Most of the time I use the Refinisher sparingly. I've used it on faded bags or worn edges to refresh the color by mixing it with Lexol.
I rehabbed a spectator city bag. If I recall correctly, I use acrylic paint in the color called linen mixed with conditioner. I have Refinisher in vanilla. It is too yellow but it doesn't look like that chart. Most of the colors on that chart aren't accurate. I might think bone might be right. The bag isn't as white as you think.
