Bnr s4 stock block

06 ms6 sport
Going to pick up a Bnr s4 but I want to know if I have build the block first. I see lots of people running the s3 on stock block is the s4 possible? I will be building my block but not anytime soon and I need to get rid of this smokey k04.
2007 mazdaspeed 3 GT
I ran a PTE 5858 on my stock block from 124k to 162k. All in the condition of the motor, maintenance, and having a good tune