I think the two are different. Mainly if you think about it with the off hand. With powerful build for all purposes you are one size larger. That means that when you use two weapon fighting you can have a two handed weapon in your main hand and a one handed weapon in your off hand. However monkey grip is only for you main hand which makes it so you would have a two handed weapon in your main hand and still need a light weapon in your off hand. That and you still have the penalty -2 penalty for attacks. To me the two are very different.<br/><br/><div class="quoteheader"><div class="topslice_quote">Quote from: Expanded Psionics</div></div><blockquote class="bbc_standard_quote">Powerful Build: The physical stature of half-giants lets them<br/>function in many ways as if they were one size category larger.</blockquote><div class="quotefooter"><div class="botslice_quote"></div></div><br/><div class="quoteheader"><div class="topslice_quote">Quote from: MIC</div></div><blockquote class="bbc_standard_quote">When wearing strongarm bracers, you can<br/>wield weapons as if you were one size<br/>category larger than normal.</blockquote><div class="quotefooter"><div class="botslice_quote"></div></div>