The Multi bicep can work the biceps like a compound bi with elbows above ears and contraction behind ears.
I’m guessing that was supposed to be a question, so yeah, they’re incredibly similar. Basically variations of a preacher curl manipulating stress on the long vs short heads.
Between the two, I’d choose the multi biceps every time based solely on the fact that Yates used one in Blood and Guts.
To make it like the compound bi, drop seat way down, sit sideways. Face left and curl right handle, then reverse. Stretch is amazing!