Nope.
There were many changes to the 954... For example, the difference between the 954 & 929 tail section can easily be seen in the amount of trunk room. The 929 has much more trunk room due to the 954 having a hinged gas tank. IMHO you would have to do way more modification then it would be worth to affix the 954 tail to a 929.Nodge : Subframes are different?