SMRT does not support this feature, as it does not have the ability to skip to a different section of the questionnaire.
One workaround would be to have two separate SMRT projects, each one with a different version of the design. However, blocks are possible using Lighthouse Studio, our current interviewing platform.
As an aside, I would also recommend updating to SMRT v4.23, which is the final version of SMRT. It has multiple fixes and improvements over v4.10. The download link and information about what changes have been made is available at http://www.sawtoothsoftware.com/support/downloads/94-support/software-downloads/870-download-smrt.