There's certainly a visible difference in the photon mapping.
In the 64-bit version the photon mapping seems to be smoother.
There might be some code in the photon mapping routines which
behaves differently when compiled in 64-bit mode.

  Btw, which version of POV-Ray did you use to render these images?
And what about other system specs?

  It will be interesting to see if there's any difference with POV-Ray 3.6
(once the source code is published) since some modifications were made
to the photon mapping routines...

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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