I have a decent number of "near-pairs" in my collection but to date I think I've made two "cosmic" matches, the knife equivalent of soulmates.
For those of you who want the full multimedia experience, hit play on this first:
[video]https://youtu.be/8lSpD7cd9Hg[/video]
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My first pair are as yet unnamed, and a small pair they are. If they were at Disney, they wouldn't be able to ride Space Mountain. If they were in a clothing store, they'd have to shop in the kids' section. If they were hands in Texas Hold'em, they would get folded every time except in the blind.
They are Case's #610096 tiny toothpick and #62156 Wharncliffe tuxedo, both with stainless blades and arrowhead shields and both in Kentucky
bluegrass bone.
Would you believe I first picked up the toothpick in this color because I wanted a green bone knife for the watch pocket and Case's other "green" offerings looked too drab? Oh well, that
bluegrass sure did look green to me...
...HA! Now you see why I selected the song in the video! (Plus, it just rocks.

)
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The pair below do have a name, "Lennie and George". George is the 1970 #62009½ red bone 2-blade 10-dot Barlow and Lennie is the 1973 #6143 daddy Barlow underneath.
George is the small and crafty fella, while Lennie's forte is brute force. Together, there's nothing they can't take on.
These two were born with matching scales, though perhaps Lennie's were installed on the wrong sides in the beginning.
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Well, thanks for listening to the tale of two twosomes. Going through some of my knives I am seeing more and more natural pairs, so I think I'll be posting some new stuff in the near future. I've also got a lot of TL-29 "cousins" and Barlow "neighbors" to sort through, so that should provide some decent couplings too.