From the Super Mario Wiki
Brobot L-Type is the new and improved version of Brobot, Mr. L's colossal robot in Super Paper Mario. Part of the Brobot L-Type's theme music is a faster-paced techno remix of the Sammer's Kingdom Theme. Although it is commonly mistaken to be a remix of Mr. L's theme, it does sound quite similar.
In Chapter 6-1, after the Sammer's Kingdom gets destroyed by The Void, Mr. L appears in the new World of Nothing. His new improved Brobot L-Type has arms, legs and is more powerful and has the capability to swallow Mario, fire rocket punches at him and slam down to the ground to try to squash Mario. He then summons Brobot L-Type and begins a duel with Mario, Bowser and Princess Peach. Using a combination of attacks by Boomer, cleverly timed jumps and proper defense strategies, the trio of heroes can manage to destroy Brobot L-Type.
Despite being an improved version of Brobot, the L-Type has less HP, however this is due to the nature of the two battles: the original robot is fought using Squirps' laser fire, which is much more damaging than normal attacks, necessitating a greater amount of HP. A similar situation arises in Wario: Master of Disguise, in which the Mad Hat Mk. III has less HP than its space-battle predecessor, the Mad Hat Mk. II.
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