[yocto] Can two build dir of different yocto version share the same download/ and sstate/ dir?

[Qiang Yu]

Hi all,

I know two build dir of the same yocto version can share download/ and
sstate/ dir to speed up build. But what if two build dir of different yocto
version, like 1.6 and 1.7?

Regards,
Qiang
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