I have a question about the 2007 gs 350’s and if the rear subframe is the same as is’s or not.

 

You should address your concerns in Normal Threads on GS forum

https://www.clublexus.com/forums/gs-...2006-2011-153/

 

2006 GS 300 is the same as 2006-2013 IS 250 RWD, 2009-2013 IS 250 AWD, and 2010-2015 IS250 C (205 mm Differential)
2006-2007 GS 430, 2006-2011 GS 350, and 2007-2011 GS 460 is the same as 2006-2013 IS 350, 2008-2014 IS F, and 2010-2015 IS 350C (208 mm Differential)

Bushing stiffness varies between models, but the subframe does not.