The blocks are identical, but the L36 has different rods and pistons. The L36 internals are a little lighter. A well prepped L36 can handle 350-400hp.
l67/32=8.5:1 iirc
l36/26=9.4:1 iirc
that is the only difference. o, and all 05+ and some 04's have powdered metal rods, which are batter then cast, but not as good a forged.