Gah - solved myself almost immediately after posting.
For posterity: version 3.5 of commons lang has a different
Bundle-SymbolicName ( org.apache.commons.lang3) in the OSGI metadata of
MINFEST.MF. Simply by bumping to lang 3.5 you'll solve this.
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I use Commons tools both version 2 and 3 together in AEM and so it should work.
That said how are you installing Commons lang and which package does need it.
If you have a custom package that needs commons lang 3 then you need to package
it with it
if it is not provided from another package.