Hello

I am thinking of upgrading the crank on an old bike to 105 so i need an octalink BB. I took out the square taper BB in my bike (this was replaced 2 years ago, now it is a BB-UN54) On the BB i saw the usual markings (BB-UN54, 68, BC 1.37x24) then where on other BBs there is a number like 113 or 118, I read D-EL. What does this mean? What BBs are compatible with my bike? Is there a way to use a different number or are they completely not compatible?

Thanks