Yes, while closely related these these concepts are different. Turing completeness differs from a Turing machine in that Turing completeness is a property, whereas a Turing machine is a mathematical model.

Turing completeness is a property of a system meaning that the system is able to simulate a Turing machine. A Turing machine is a mathematical model of computation describing a system that can compute any computable function, given sufficient time and memory. 

This means that because Conway's Game of Life is Turing complete it can compute any computable function. However, Conway's Game of Life itself is not a Turing machine.
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