There doesn't seem to be any difference between them?
When using them in-game there's no increase to the drain effect at all.
Looking at the 3 different .lua's it shows that they all do the exact same thing, except different TP costs.
Drain Samba 1, 2 and 3
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Re: Drain Samba 1, 2 and 3
sambas are sitting in a cold abyss of "eventually getting removed and redone in a way that doesn't suck"