BMX crank into a MTB??

Bentert

Dirt Disciple
Afternoon Gents,

whilst my frame is out sitting in the sun covered in nitromorse I've a questions on cranks and bottom brackets.





This is the crank that I currently have, I want to use these crank arms (as they are the same as my Haro BMX)


picture uploading

Do I need a different bottom bracket to fit the arms on?
All this MTB stuff is really confusing.
 
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