Both looks same only.
https://partsurfer.hpe.com/Search.aspx?SearchText=BK829A
https://partsurfer.hpe.com/ShowPhoto.aspx?partnumber=629074-001
https://partsurfer.hpe.com/Search.aspx?SearchText=BK829B
https://partsurfer.hpe.com/ShowPhoto.aspx?partnumber=629074-002
We can see BK829B is functional equivalent(FE) part of BK829A so it shouldn't be problem to use BK829B
Hope this helps!
Regards
Subhajit
I am an HPE employee
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