It's not a 100% guarantee of what the engine might be but here is a very simple visual check. 

The 160TF has the VVC engine which produces its peak power at a higher RPM.  To this end, you will see the rev counter red line in a different place.  Off the top of my head, I can't remember the numbers exactly but the non-VVC red lines at about 6,750rpm and the VVC red lines at about 7,250rpm - i.e. on the 160 the red line will be above 7,000rpm and the red line on the135 will be below 7,000rpm.

The vehicle index number (VIN) also indicates the power output.   Lots of useful information here on the Rimmer website

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