Anyone know what is the weight different between Rotor's 3D and 3d+ cranksets?

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Regular 3D comes in two flavours: steel and titanium axle.

Steel is 530 grams, ti 496. 3D+ weighs in at 476 (all according to Rotor, not actually weighted by me).

3D titanium hasn't been in production for nearly two years.

I can confirm 3D+ is 478 for cranks without rings. Supplied spacer if using one for a BBRight is 7g.
I am guessing with your signature this is for the Cervelo and you are going BBRight. I had that setup and in the end was not real impressed with the cranks but you really don't have many options.
For the price it's rather disgusting since they cost as much as Hollowgrams.

In the UK their price isn't even close to Hollowgrams - you could almost get 2 sets of Rotors for the price of a set of Hollowgram cranks!

I really liked my Rotors when I had them - light enough, really stiff and look good on the right bike.

im using rotor Q chain ring and was thinking to change my ultegra crank arm to rotor Q. Wonder will it be any different?