can :sp borrow something from :b

Dear list:
assume i have two buffers in my vim session

1 abc.txt
2 xyz.txt

I am currently in buffer 1 abc.txt

I can use :b z and tab completion to open buffer 2 xyz.txt because vim is smart to determine that only buffer 2 has letter z in its name

now I want use :sp z to have the same smartness but it doesn't seem to work that way. I can only sp #2 to split the second buffer.

Could anyone share some ideas?

Thanks!
Jim.

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